Boiling point of certain liquid

Let Us learn how water evaporates


What is Evaporation?
Evaporation takes place at all temperatures. Rate of evaporation increases with rise in temperature and becomes maximum at the boiling point of the liquid. The process of evaporation also increases with increase in surface area of the liquid.

Evaporation is an essential part of the water cycle. Solar energy drives evaporation of water from oceans, lakes, moisture in the soil, and other sources of water. Evaporation is caused when water is exposed to air and the liquid molecules turn into water vapor which rises up and forms clouds.

Evaporation requires energy. A liquid draws heat energy from the surrounding thereby cooling the surrounding.

Evaporation is the process by which water is converted from its liquid form to its vapor form and thus transferred from land and water masses to the atmosphere. Evaporation from the oceans accounts for 80% of the water delivered as precipitation, with the balance occurring on land, inland waters and plant surfaces.

As shown above, the rate of evaporation depends upon:

• Wind speed: the higher the wind speed, the more evaporation
• Temperature: the higher the temperature, the more evaporation
• Humidity: the lower the humidity, the more evaporation
  

Water cycle in nature is initiated by the evaporation of water from lakes, ponds, rivers, sea, etc. Water evaporates due to sun's heat. Water vapor rises to the sky to from clouds. Clouds condense to form raindrops, which fall on the earth. And the water cycle continues.

Thus, The boiling point of a liquid substance is the temperature at which the vapor pressure of the liquid equals the external pressure on the liquid. Vapor bubbles form in the liquid, rise to the surface and burst, causing the liquid to boil.