What is the importance of evaporation? Where is this technique used on a large scale? class 9
Answers
Answer:
evaporation kids the germs present in liquid
Answer:
A1. Perspiration cools our body through evaporation.
2. The evaporation of liquid from the earth helps to keep the air moist and provides moisture to the clouds.
3. In industries, evaporation is used as a treatment of separation.
4. it cools our body from the sweat through evaporation.
5. The evaporation of liquid from the earth helps to keep the air moist and provide moisture to the clouds.
B1. Evaporative equilibrium
Vapor pressure of water vs. temperature. 760 Torr = 1 atm.
If evaporation takes place in an enclosed area, the escaping molecules accumulate as a vapor above the liquid. Many of the molecules return to the liquid, with returning molecules becoming more frequent as the density and pressure of the vapor increases. When the process of escape and return reaches an equilibrium,[4] the vapor is said to be "saturated", and no further change in either vapor pressure and density or liquid temperature will occur. For a system consisting of vapor and liquid of a pure substance, this equilibrium state is directly related to the vapor pressure of the substance, as given by the Clausius–Clapeyron relation:
where P1, P2 are the vapor pressures at temperatures T1, T2 respectively, ΔHvap is the enthalpy of vaporization, and R is the universal gas constant. The rate of evaporation in an open system is related to the vapor pressure found in a closed system. If a liquid is heated, when the vapor pressure reaches the ambient pressure the liquid will boil.
The ability for a molecule of a liquid to evaporate is based largely on the amount of kinetic energy an individual particle may possess. Even at lower temperatures, individual molecules of a liquid can evaporate if they have more than the minimum amount of kinetic energy required for vaporization.
Explanation: