HEAT, WORK AND STEADY FLOW ENERGY EQUATION CLASS NOTES
HEAT, WORK AND STEADY FLOW
ENERGY EQUATION CLASS
NOTES
COMPARISON BETWEEN HEAT AND WORK
SIMILARITIES
Sr No |
Heat |
Work |
1 |
Form of energy |
Form of energy |
2 |
Across a boundary |
Across a boundary |
3 |
Cross the boundary whenever there is a change of state of a body |
Cross the boundary whenever there is a change of state of a body |
4 |
It is a path function and hence is an exact differential |
It is a path function and hence is an exact differential |
DIFFERENCES BETWEEN HEAT AND WORK
Sr. No |
Heat |
Work |
1 |
Heat is a cheaper and poor grade of energy |
Work is a better grade of energy. |
2 |
It can be produced anywhere by any simple means like rubbing hands. |
This requires motion. |
3 |
(i)Mainly it is produced by friction.(ii) It is also produced by burning . |
Heat causes motion but a small work is obtained from a large amount of heat. Electricity also causes motion. |
4 |
Only a fraction of it can be converted to work. |
Work can be converted fully into heat and vice versa is not possible. |