Thermal Energy - Revision history

Wlu331 at 03:35, 29 April 2026

2026-04-29T03:35:11Z

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	Physics Significance: Because it is an absolute scale, Kelvin is the required unit for most calculations in physics (including the Kinetic Molecular Theory and thermal energy equations). It allows physicists to state mathematically that a substance at 200 K has exactly twice the microscopic thermal energy as a substance at 100 K.		Physics Significance: Because it is an absolute scale, Kelvin is the required unit for most calculations in physics (including the Kinetic Molecular Theory and thermal energy equations). It allows physicists to state mathematically that a substance at 200 K has exactly twice the microscopic thermal energy as a substance at 100 K.

			==General Test Tips==

			Writing from the perspective of a Physics 2211 student, here are some things that I found helpful when solving thermal energy problems.

			===Thermal Equilibrium Problems===

			With thermal equilibrium problems, the problem solving process is almost ALWAYS the same.

			First, calculate the initial thermal energy of the system. This includes the total thermal energy of the system, as well as the thermal energy of the substance being added.

			Second, know that the initial thermal energy will always equal the final thermal energy, unless otherwise stated. At thermal equilibrium, the TEMPERATURE is the same, and we should know the masses and specific heat of both substances.

			Third, given all the knowns, we can calculate unknowns using the equation Qtotal = M * C * T, as we know Qtotal and T, and will vary in knowledge between M and C.



	==See also==		==See also==

Wlu331: /* History */

2026-04-29T02:58:43Z

History

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	Thermal Energy was discovered by a man named James Joule in the 1840's. Careful experiments showed that the temperature increase of an object and its surroundings due to friction is directly related to the amount of mechanical energy lost. Joule carried out one of the most famous experiments, demonstrating this fact. Joule hung some weights from pulleys, so that as they fell, they turned a paddle-wheel apparatus immersed in a bucket of water. The friction between the paddles and the water raised the water’s temperature by an amount that was directly proportional to the distance that the weights fell. In our modern system of units, Joule found that raising the temperature of a kilogram of water by one degree Celsius required a loss in mechanical (gravitational) energy of approximately 4,200 Joules. Joule therefore proposed that this mechanical energy is not actually lost, but converted into a new type of energy: Thermal Energy, which manifests itself as an increase or decrease in temperature.		Thermal Energy was discovered by a man named James Joule in the 1840's. Careful experiments showed that the temperature increase of an object and its surroundings due to friction is directly related to the amount of mechanical energy lost. Joule carried out one of the most famous experiments, demonstrating this fact. Joule hung some weights from pulleys, so that as they fell, they turned a paddle-wheel apparatus immersed in a bucket of water. The friction between the paddles and the water raised the water’s temperature by an amount that was directly proportional to the distance that the weights fell. In our modern system of units, Joule found that raising the temperature of a kilogram of water by one degree Celsius required a loss in mechanical (gravitational) energy of approximately 4,200 Joules. Joule therefore proposed that this mechanical energy is not actually lost, but converted into a new type of energy: Thermal Energy, which manifests itself as an increase or decrease in temperature.

	The Fahrenheit Scale (1724):		===The Fahrenheit Scale (1724)===
	Developed by the physicist Daniel Gabriel Fahrenheit, this was the first standardized temperature scale to gain widespread use, largely because Fahrenheit also invented the first reliable mercury-in-glass thermometer.		Developed by the physicist Daniel Gabriel Fahrenheit, this was the first standardized temperature scale to gain widespread use, largely because Fahrenheit also invented the first reliable mercury-in-glass thermometer.

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	The Adjustment: The scale was later slightly recalibrated so that the boiling point of water would be exactly 212°F, creating exactly 180 degrees of separation between the freezing and boiling points of water at sea level. This recalibration shifted normal human body temperature to roughly 98.6°F.		The Adjustment: The scale was later slightly recalibrated so that the boiling point of water would be exactly 212°F, creating exactly 180 degrees of separation between the freezing and boiling points of water at sea level. This recalibration shifted normal human body temperature to roughly 98.6°F.

	The Celsius Scale (1742):		===The Celsius Scale (1742)===
	Created by the Swedish astronomer Anders Celsius, this scale aimed to simplify thermometry by strictly anchoring it to the phase changes of water and utilizing a base-100 system.		Created by the Swedish astronomer Anders Celsius, this scale aimed to simplify thermometry by strictly anchoring it to the phase changes of water and utilizing a base-100 system.

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	The Inversion: Shortly after Celsius's death in 1744, the Swedish botanist Carl Linnaeus (along with other scientists) inverted the scale to the modern format we use today, where 0°C is freezing and 100°C is boiling. For a long time, it was simply called the "centigrade" scale (meaning 100 steps) until it was officially named after Celsius in 1948.		The Inversion: Shortly after Celsius's death in 1744, the Swedish botanist Carl Linnaeus (along with other scientists) inverted the scale to the modern format we use today, where 0°C is freezing and 100°C is boiling. For a long time, it was simply called the "centigrade" scale (meaning 100 steps) until it was officially named after Celsius in 1948.

	The Kelvin Scale (1848)		===The Kelvin Scale (1848)===
	While Fahrenheit and Celsius are based on arbitrary observable phenomena (like freezing water or brine), the Kelvin scale is rooted in fundamental thermodynamics. It was proposed by the Scottish physicist William Thomson, 1st Baron Kelvin.		While Fahrenheit and Celsius are based on arbitrary observable phenomena (like freezing water or brine), the Kelvin scale is rooted in fundamental thermodynamics. It was proposed by the Scottish physicist William Thomson, 1st Baron Kelvin.

Wlu331: /* History */

2026-04-29T02:56:05Z

History

← Older revision		Revision as of 22:56, 28 April 2026
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	Thermal Energy was discovered by a man named James Joule in the 1840's. Careful experiments showed that the temperature increase of an object and its surroundings due to friction is directly related to the amount of mechanical energy lost. Joule carried out one of the most famous experiments, demonstrating this fact. Joule hung some weights from pulleys, so that as they fell, they turned a paddle-wheel apparatus immersed in a bucket of water. The friction between the paddles and the water raised the water’s temperature by an amount that was directly proportional to the distance that the weights fell. In our modern system of units, Joule found that raising the temperature of a kilogram of water by one degree Celsius required a loss in mechanical (gravitational) energy of approximately 4,200 Joules. Joule therefore proposed that this mechanical energy is not actually lost, but converted into a new type of energy: Thermal Energy, which manifests itself as an increase or decrease in temperature.		Thermal Energy was discovered by a man named James Joule in the 1840's. Careful experiments showed that the temperature increase of an object and its surroundings due to friction is directly related to the amount of mechanical energy lost. Joule carried out one of the most famous experiments, demonstrating this fact. Joule hung some weights from pulleys, so that as they fell, they turned a paddle-wheel apparatus immersed in a bucket of water. The friction between the paddles and the water raised the water’s temperature by an amount that was directly proportional to the distance that the weights fell. In our modern system of units, Joule found that raising the temperature of a kilogram of water by one degree Celsius required a loss in mechanical (gravitational) energy of approximately 4,200 Joules. Joule therefore proposed that this mechanical energy is not actually lost, but converted into a new type of energy: Thermal Energy, which manifests itself as an increase or decrease in temperature.

	The Fahrenheit Scale (1724)		The Fahrenheit Scale (1724):
	Developed by the physicist Daniel Gabriel Fahrenheit, this was the first standardized temperature scale to gain widespread use, largely because Fahrenheit also invented the first reliable mercury-in-glass thermometer.		Developed by the physicist Daniel Gabriel Fahrenheit, this was the first standardized temperature scale to gain widespread use, largely because Fahrenheit also invented the first reliable mercury-in-glass thermometer.

Line 189:		Line 189:
	The Adjustment: The scale was later slightly recalibrated so that the boiling point of water would be exactly 212°F, creating exactly 180 degrees of separation between the freezing and boiling points of water at sea level. This recalibration shifted normal human body temperature to roughly 98.6°F.		The Adjustment: The scale was later slightly recalibrated so that the boiling point of water would be exactly 212°F, creating exactly 180 degrees of separation between the freezing and boiling points of water at sea level. This recalibration shifted normal human body temperature to roughly 98.6°F.

	The Celsius Scale (1742)		The Celsius Scale (1742):
	Created by the Swedish astronomer Anders Celsius, this scale aimed to simplify thermometry by strictly anchoring it to the phase changes of water and utilizing a base-100 system.		Created by the Swedish astronomer Anders Celsius, this scale aimed to simplify thermometry by strictly anchoring it to the phase changes of water and utilizing a base-100 system.

Wlu331: /* History */

2026-04-29T02:52:18Z

History

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 ==History==
 Thermal Energy was discovered by a man named James Joule in the 1840's. Careful experiments showed that the temperature increase of an object and its surroundings due to friction is directly related to the amount of mechanical energy lost. Joule carried out one of the most famous experiments, demonstrating this fact. Joule hung some weights from pulleys, so that as they fell, they turned a paddle-wheel apparatus immersed in a bucket of water. The friction between the paddles and the water raised the water’s temperature by an amount that was directly proportional to the distance that the weights fell. In our modern system of units, Joule found that raising the temperature of a kilogram of water by one degree Celsius required a loss in mechanical (gravitational) energy of approximately 4,200 Joules. Joule therefore proposed that this mechanical energy is not actually lost, but converted into a new type of energy: Thermal Energy, which manifests itself as an increase or decrease in temperature.
 ==See also==

Wlu331: /* Main Idea */

2026-04-29T02:49:23Z

Main Idea

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	'''Claimed by William Lu (Spring 2026)'''		'''Claimed by William Lu (Spring 2026)'''

	==~~Main Idea~~==		==Overview==
	All objects are made up of atoms and molecules-- so many that it would take longer than the ~~Universe~~'s estimated lifetime to count. ~~The~~ constant and random motion of an object's atoms ~~or molecules~~ is what determines its Thermal Energy. Thermal Energy is a component of internal energy, but is unrelated to the vibrational and rotational energy of a solid's atoms. Instead, Thermal Energy occurs from atoms' translational motion.		All objects are made up of atoms and, on a larger scale, molecules-- so many that it would take longer than the universe's estimated lifetime to count. At an atomic scale, all particles hold an internal kinetic energy, such that no subatomic particle is ever fully still. This constant and random motion of an object's atoms is what determines its Thermal Energy. Thermal Energy is a component of internal energy, but is unrelated to the vibrational and rotational energy of a solid's atoms. Instead, Thermal Energy occurs from atoms' translational motion as a result of their internal kinetic energy.

	When we say "change of thermal energy," we mean that it is the part of the internal energy that is associated with a [[Thermal Energy#Temperature\| Temperature]] change. Thermal Energy is quantified using temperature. This quantification describes the approximate average ~~Thermal~~ Kinetic Energy present in all of the atoms or molecules in the object/sample/system. In the real world, it is often impossible to accurately state how much of an object's internal energy is Thermal. However, if the Heat Capacity and mass of am object is known, we can measure its temperature using a thermometer and calculate its Thermal Energy.		When we say "change of thermal energy," we mean that it is the part of the internal energy that is associated with a [[Thermal Energy#Temperature\| Temperature]] change. Thermal Energy is quantified using temperature. This quantification describes the approximate average Kinetic Energy present across all of the atoms or molecules in the object/sample/system. In the real world, it is often impossible to accurately state how much of an object's internal energy is Thermal. However, if the Heat Capacity and mass of an object are known, we can measure its temperature using a thermometer and calculate its Thermal Energy.

	===A Mathematical Model===		===A Mathematical Model===

Wlu331 at 02:26, 29 April 2026

2026-04-29T02:26:46Z

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	'''Claimed by ~~Erin Yoon~~ (Spring ~~2023~~)'''		'''Claimed by William Lu (Spring 2026)'''

	==Main Idea==		==Main Idea==

Eyoon35 at 03:58, 17 April 2023

2023-04-17T03:58:55Z

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	:http://physics.weber.edu/schroeder/eee/chapter3.pdf		:http://physics.weber.edu/schroeder/eee/chapter3.pdf

			:https://www.aps.org/publications/apsnews/200912/physicshistory.cfm#

	:https://www.sciencedirect.com/topics/engineering/specific-heat-capacity		:https://www.sciencedirect.com/topics/engineering/specific-heat-capacity

	:https://commons.wikimedia.org/wiki/File:Pure_iron_phase_diagram_(EN).svg		:https://commons.wikimedia.org/wiki/File:Pure_iron_phase_diagram_(EN).svg

Eyoon35 at 03:56, 17 April 2023

2023-04-17T03:56:07Z

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	:https://www.sciencedirect.com/topics/engineering/specific-heat-capacity		:https://www.sciencedirect.com/topics/engineering/specific-heat-capacity

			:https://commons.wikimedia.org/wiki/File:Pure_iron_phase_diagram_(EN).svg

Eyoon35 at 03:54, 17 April 2023

2023-04-17T03:54:28Z

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	===Computational Model===		===Computational Model===
	PhET allows free public usage of their simulations in an educational context. Their simulation [https://phet.colorado.edu/en/simulations/energy-forms-and-changes/ Energy Forms and Changes] is a useful visual companion to practice calculating specific heat capacities and thermal energies of materials.		PhET by the University of Colorado Boulder allows free public usage of their simulations in an educational context. Their simulation [https://phet.colorado.edu/en/simulations/energy-forms-and-changes/ Energy Forms and Changes] is a useful visual companion to practice calculating specific heat capacities and thermal energies of materials.

	''Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC-BY-4.0 (https://phet.colorado.edu).''		''Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC-BY-4.0 (https://phet.colorado.edu).''

Eyoon35 at 03:53, 17 April 2023

2023-04-17T03:53:03Z

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	==Connectedness==		==Connectedness==
	Thermal Energy is a phenomenon ~~that is~~ present in all aspects of life. Everything from the Sun to an ice cube contains, emits, and absorbs thermal energy. In order to convert thermal energy to other, more useful forms an engine must be used. For example, steam carries a large amount of thermal energy ~~and therefore is~~ used ~~to carry energy efficiently and carry out manufacturing processes~~. Similarly, Thermal Energy is ~~one of the largest contributors to the determination of the phase~~ in which a ~~substance~~ exists, ~~an aspect~~ of ~~physics~~ that ~~plays a very large role~~ in ~~engineering~~. One of the interesting industrial application of thermal energy is industrial thermal energy storage. Thermal energy storage is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used at a later time for heating and cooling applications and power generation.		[[File:phasediagramiron.PNG\|right\|250px]]
			Thermal Energy is a phenomenon present in all aspects of life. Everything from the Sun to an ice cube contains, emits, and absorbs thermal energy. In order to convert thermal energy to other, more useful forms an engine must be used. For example, steam carries a large amount of thermal energy, which can be used mechanically via steam engines. Similarly, Thermal Energy is integral in determining which phase of matter a material exists in. For example, at left is a phase diagram of iron-- it can be seen from the axes that what phase iron is in is determined by the surrounding pressure and the iron's temperature.

			One of the interesting industrial application of thermal energy is industrial thermal energy storage. Thermal energy storage is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used at a later time for heating and cooling applications and power generation.

	==History==		==History==
	Thermal Energy was discovered by a man named James Joule in the 1840's. Careful experiments showed that the temperature increase of an object and its surroundings due to friction is directly related to the amount of ~~Mechanical Energy~~ lost. Joule carried out one of the most famous experiments, demonstrating this fact. Joule hung some weights from pulleys, so that as they fell, they turned a paddle-wheel apparatus immersed in a bucket of water. The friction between the paddles and the water raised the water’s temperature by an amount that was directly proportional to the distance that the weights fell. In our modern system of units, Joule found that raising the temperature of a kilogram of water by one degree Celsius required a loss in mechanical (gravitational) energy of approximately 4,200 Joules. Joule therefore proposed that this mechanical energy is not actually lost, but converted into a new type of energy: Thermal Energy, which manifests itself as an increase or decrease in temperature.		Thermal Energy was discovered by a man named James Joule in the 1840's. Careful experiments showed that the temperature increase of an object and its surroundings due to friction is directly related to the amount of mechanical energy lost. Joule carried out one of the most famous experiments, demonstrating this fact. Joule hung some weights from pulleys, so that as they fell, they turned a paddle-wheel apparatus immersed in a bucket of water. The friction between the paddles and the water raised the water’s temperature by an amount that was directly proportional to the distance that the weights fell. In our modern system of units, Joule found that raising the temperature of a kilogram of water by one degree Celsius required a loss in mechanical (gravitational) energy of approximately 4,200 Joules. Joule therefore proposed that this mechanical energy is not actually lost, but converted into a new type of energy: Thermal Energy, which manifests itself as an increase or decrease in temperature.

	==See also==		==See also==