. Explain the First law of thermodynamics
Energy may be converted from one form to another, but it is impossible to create or destroy it. There are various ways of expressing the first law of thermodynamics. Some of the selected statements are given below:
i. When work is transformed into heat or heat into work, the quantity of work is mechanically equivalent to the quantity of heat.
ii. Energy of an isolated system must remain constant, although it may be transformed from one form to another.
iii. Energy in one form, if it disappears will make its appearance in an exactly equivalent in another form.
iv. It is never possible to construct a perceptual motion machine that could produce work without consuming any energy.