The boiling point of the water is defined as:

The constant pressure at which water changes to steam

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The constant volume at which water changes to steam

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The constant temperature at which water changes to steam

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None of these

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Solution

The correct option is C
The constant temperature at which water changes to steam

The boiling point of the water is defined as the temperature at which water changes to steam. During boiling the temperature remains constant i.e. from the time boiling of water starts, to the time all of the water is converted to vapour, the temperature of the water remains constant, i.e. 100 $^{\circ} C$ .

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Q. The ............... of water is defined as the constant temperature at which water changes to steam.

Q. Fill in the blanks :

The ........................... of water is defined as the constant temperature at which water changes to steam.

Let 1.00 kg of liquid water at $100^{\circ} C$ be converted to steam at $100^{\circ} C$ by boiling at standard atmospheric pressure (which is 1.00 atm or 1.01 $\times$ 105 Pa) in the arrangement as shown. The volume of that water changes from an initial value of $1.00 \times 10^{- 3}$ $m^{3}$ as a liquid to 1.671 $m^{3}$ as steam.

What is the change in the system's internal energy during the process?

When 1.8 g of steam at the normal boiling point of water is converted into water at the same temperature, enthalpy and entropy changes respectively will be $(Δ H_{v a p} (f o r w a t e r = 4.08 k J m o l^{- 1})$

2 k g

of water is converted into steam by boiling at atmospheric pressure. The volume changes from

2 \times 10^{- 3} m^{3}

3.34 m^{3}

. The work done by the system is about

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