Question

At what temperature does water boil?

Answer 1

Hint: The temperature at which liquid starts to boil and turn into vapor is known as boiling point or we can say the temperature at which vapor pressure of liquid equals pressure surrounding the liquid is known as boiling point.

Complete step by step answer:
Since the boiling point is a physical property it can be measured or observed without changing the composition of the substance. The boiling point of water is $100^\circ C$. And in kelvin, it is equal to $273 + 100 = 373K$ at one-atmosphere pressure.
 We can also calculate the boiling point of water in Fahrenheit the relation given as $F = \dfrac{9}{5}^\circ C + 32$. As we know in $^\circ C$ the boiling point of water is 100, on putting the value in the above relation we get:
$F = \dfrac{9}{5} \times 100 + 32$
$ \Rightarrow F = 9 \times 20 + 32$
$ \Rightarrow F = 180 + 32$
$ \Rightarrow F = 212$
Hence the boiling point of water in $212^\circ F$.

Additional information: The boiling point of a liquid depends upon the vapour pressure of the liquid. Vapour pressure of the liquid is defined as the amount of pressure exerted at the surface of the liquid at equilibrium. As the vapour pressure increases the boiling point decreases and vice-versa.


Note:
The boiling point of any liquid depends upon the surrounding environmental pressure. As there is change observed in surrounding pressure then the boiling point also changes. For example, a liquid in a partial vacuum has a lower boiling point whereas the liquid at higher pressure has a higher boiling point than the liquid is at atmospheric pressure. If we talk about the water its boiling point gets the change to $93.^oC$ or $200.1^oF$ at 1905 meters altitude.