Heat Capacity

Introduction

How much heat (Q) from a body should be returned to the coldest surroundings or on the contrary - coldest surrounding receives from the body, is determined by the temperature difference between the body and its surrounding.

It should be noted that during the process you can change the condition of the substance. For example, while the water cools down the ice melts on the other hand while the water starts to boil  water evaporates. Also, if under normal pressure and temperature that doesn't go under 0℃ the water does not freeze. Now, suppose that the substance and the process status doesn't happen. Then the substance only heats up or cools. Temperature difference is the only value that is given or received the body heat Q. It also depends on the body weight of the quantity of the substance. 

For each substance, only the inherent in the ability to receive or heat.This ability is for each substance the specific heat.

The heat capacity of a defined system is the amount of heat (usually expressed in joules) needed to raise the system's temperature by one degree (usually expressed in Kelvin). It is expressed in units of thermal energy per degree temperature. To aid in the analysis of systems having certain specific dimensions, molar heat capacity and specific heat capacity can be used. To measure the heat capacity of a reaction, a calorimeter must be used. Bomb calorimeters are used for constant volume heat capacities, although a coffee-cup calorimeter is sufficient for a constant pressure heat capacity.

The video will help you understand the following topics:

  1. Heat Capacity basics.

  2. What is Specific Heat ?

  3. Heat Capacity and Specific Heat in real life.

https://www.youtube.com/watch?v=hC_NKgHF1MM

 

Task

  1. How do you define heat capacity?
  2. Do different fluids store heat differently ?
  3. What formula is used to complete equation for heat capacity?
  4. Which fluid stores heat most efficiently?
  5. When is Q positive? 
  6. True or false; After infinite amount of time the temperatures of the fluid and the environment won't even out.
  7. What precondition is needed in order for outcome of the equation to be 0?
  8. True or False; Liquids with higher heat capacity is going to have a greater significant in the final temperature.

Process

The following exercises contains 8 questions. All of the questions are taken from the video you watched.

Write your results on a sheet of paper, you have to answer six questions ( the answers should contain maximum of 2 sentences) and chose between true or false in the two tasks. 

Evaluation

The correct answers for the given tasks.

  1. With capital C .

  2. Yes.

  3. C=Q/▲T

  4. Water.

  5. Q>0 if heat is added to the system.

  6. False.

  7. The precondition is the fluid needs to be insulated.

  8. True.

 



     

Conclusion

The topic about "Heat Capacity" gives a great insight in the world of heat. And helps you use this new-gained knowledge in real life. Hope you enjoyed the lesson and score great marks.

Credits

Teacher Page

Aleksis Štokmanis 11.a