write the equation for calculating heat.

Question

Write the equation for calculating heat.  Include the meanings for each symbol and the appropriate labels.

Answer 1

There are many equations for calculating heat transfer, depending on the particular process.  I will give you two examples.  

 

(1)

 

Suppose you have a solid of mass m and specific heat c.  Suppose it is heated from an initial temperature T_i to a final temperature T_f.  The heat Q transferred to the mass is given by

 

Q = mcΔT = mc(T_f - T_i)

 

(2)

 

Suppose you heat a gas and cause a change in its internal energy U and the gas expands, producing work W.  The heat transferred to the gas is given by

 

Q = ΔU + W