1. The problem statement, all variables and given/known data When we heat an object,it expands.Is work done by the object in this process? Is heat given to the object equal to the increase in its internal energy ? 2. Relevant equations 3. The attempt at a solution Had it been a gas ,the work done would be pΔv,but I am unclear how do we see the work done in general while an object expands.I am assuming,the object may be a solid or a liquid. I am unsure whether the problem assumes the object is a gas. Kindly help me in clearing the doubt.