Specific Heat Capacity: Difference between revisions

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by Dejan Tojcic


==Specific Heat Capacity ==
Specific Heat Capacity is simply a physical quantity that represents the ratio of the amount of heat taken or added to substance or object which results in a temperature change. The formal definition of Specific Heat is the amount of heat required to raise the temperature of 1 gram of a substance 1°C. The Standard Unit(SI) of this quantity is, joule per celsius per kilogram or or  <math>\mathrm{\tfrac{J}{°C*Kg}}</math>. Different objects/substances have different specific heat capacities because every object has a varying mass, molecular structure, and numbers of particles per unit mass specific, and since specific heat capacity is reliant on mass, every different object has a different specific heat capacity.
[[File:specificheatmetals.jpg]]
===A Mathematical Model===
In order to find the Specific Heat Capacity of a substance, we use the equation:<math> \Delta E_{\mathrm{thermal}} = C * M * \Delta T </math>,  and rearrange it to get <math> C= \Delta E_{\mathrm{thermal}} /( M * \Delta T) .</math> where ''C'' is the Specific Heat Capacity with units of joules per celsius per kilogram or  <math>\mathrm{\tfrac{J}{°C*Kg}}</math>, ''M'' is the mass measured in kilograms or <math>\mathrm{kg}</math>, ''<math> \Delta E_{\mathrm{thermal}} </math>''  represents the change in thermal energy measured by joules or <math>\mathrm{J}</math>, and  ''<math> \Delta T </math>'' represents change in temperature with units celsius or <math>\mathrm{°C.}</math>
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===A Computational Model===
How do we visualize or predict using this topic. Consider embedding some vpython code here [https://trinket.io/glowscript/31d0f9ad9e Teach hands-on with GlowScript]
=Simple Example=
'''''Question'''''
It takes 487.5 J to heat 25 grams of copper from 25 °C to 75 °C. What is the specific heat in Joules/g·°C?
[[File:Zvezda33.jpg]]
'''''Solution'''''
This problem is very simplistic in nature as we are simply need to plug all of the values into the equation.
Remembering the equation
[[File:Zvezda5.jpg]]
All we have to do is rearrange it and solve for the specific heat capacity
[[File:zvezda6.jpg]]
Knowing that  ''<math> \ Q </math>'' or  ''<math> \Delta E_{\mathrm{thermal}} </math>'' is equal to the change in thermal energy, we can plug in ''487.5 Joules'' into the equation, so now we have
<math> C= 487.5  joules /( M * \Delta T) .</math>
Next, looking at the question it looks like we are given the mass or <math>\mathrm{M}</math> which is ''25 grams'' or . And can now plug that into the equation to get
<math> C= 487.5  joules /(25g * \Delta T) .</math>
Lastly, when we read the problem we see that we are given ''<math> \Delta T </math>'' which in this case would be <math> (75 °C-25 °C) </math> or <math> 50 °C </math>. We can finally solve for the value of <math>\mathrm{C}</math> which is
<math> C= 487.5  joules /( 25g * 50 °C) .</math>
and we finally conclude that
<math> C= .39{\tfrac{J}{g*°C}}</math> or the specific heat of copper is .39 J/(g*°C).
=Intermediate example=
'''''Question''''' What is the final temperature when 625 grams of water at 75.0° C loses 7.96 x 10^4 J?
[[File:zvezda7.jpg]]
----
'''Solution'''
=Hard Example=
=Connectedness=
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Latest revision as of 09:49, 2 August 2019