Question

The boiling point of water at sea level is
(a) 0°C
(b) 273 K
(c) 373 K
(d) 273°C

Answer 1

Answer:

The boiling point of water at sea level is 373 K

Explanation:

The atmospheric pressure at the sea level is high as compared to the ones at higher altitude. At a higher elevation, the atmospheric pressure is low meaning heated water reaches its boiling point faster i.e., at a lower temperature.

The boiling point at the sea level is 373 K or 100°C . Boiling of water is an exothermic process and heat is involved in it.

Answer 2

Answer:

The boiling point of water at sea level is  373 K (212°F or 100°C).

Explanation:

• When a liquid is heated, it ultimately reaches a point where the vapour pressure becomes so high that bubbles begin to develop inside the liquid's body. This is known as the boiling point.
• When a liquid begins to boil, the temperature doesn't change until all of the liquid has been transformed into a gas.
• The atmospheric pressure, which varies with altitude, affects the boiling point of water.
• As altitude increases,the atmospheric pressure is low. Hence the temperature at which water boils decreases (e.g., higher on a mountain).
• On the other hand, as the altitude decreases, the atmospheric  pressure increases. Hence, water boils at a greater temperature (coming back down to sea level or going below it).
• Thus, at 1 atmosphere of pressure (sea level), water boils at 373K (212° F).

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