Question

What will be the external pressure at which water may boil at 120 degree Centigrade? A. 1489mm Hg B. 790mm Hg C. 700mm Hg D. 100mm Hg?
The answer is 1489 mm Hg but I don't know the reason. Please state the reason

Answer 1

Answer:

At high altitude such as at Murree where atmospheric pressure is 0.921 atm (i.e. 700 mm of Hg), water boils at 98°C. While at the ...

Answer 2

Answer:

1489 mm Hg

Explanation:

the reason is that,

The boiling point is directly proportional to the external pressure.

As the external pressure increase, the boiling point increase and vice versa

At 1 atmospheric pressure water boils at 100°C.

At high altitude such as at Murree where atmospheric pressure is 0.921 atm (i.e. 700 mm of Hg), water boils at 98°C.

While at the top of Mount Everest water boils at only 69°C.

Here is an increase in the boiling point means external pressure is increased.

The boiling point of water is 120°C at 1489 torr (1489 mm of Hg).