When unit mass of water boils to become ...

When unit mass of water boils to become steam at `100^(@)C`, it absorbs Q amount of heat. The densities of water and steam at `100^(@)C` are `rho_(1)` and `rho_(2)` respectively and the atmospheric pressure is `P_(0)`. The increase in internal energy of the water is

`Q + P _(0) ((1)/(rho _(1)) - (1)/(rho _(2)))`

`Q+p_(0)((1)/(rho _(2)) - (1)/(rho _(1)))`

`Q-p_(0)((1)/(rho _(1)) - (1)/(rho _(2)))`

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