Question

explain why 1 ) when the humidity of all is low, then the rate of evaporation is high. 2 ) the rate of evaporation is liquid increases with increasing the wind speed

Answer 1

1.Humidity is nothing but saturation of atmosphere with water vapour(molecules). More humid is the air,more water it contains. So with more humidity the water intake capacity of air decrease i.e.it gets more saturated. Evapouration is the process by which extra water vapour is added to atmosphere. So naturally with more humidity the evapouration rate decreases. Humid air adds an extra pressure on water reservoirs, which in turn helps the surface molecules of the reservoirs to stay in contact with rest of the molecules. 
Now, at a fixed temperature air has a fixed humidity (saturation) level. So if temperature changes,so will the humidity and evapouration. Read a thermodynamics book for more specific interpretation.
2.
Approximately 80% of all water that falls as precipitation comes from water that evaporated from the ocean. The speed of wind is an important factor in the rate of this evaporation because the wind moves humid air away and pulls in drier air, thus increasing the rate of evaporation. The walls inside a cave where there is water are an example of the affect of the absence of wind. The walls in a cave that hold a stream or pool of water will be wet all the time due to condensation of water out of the air. Wind doesn’t move the wet air out of the cave so it continues to absorb water until it can’t hold any more. Once the air reaches saturation, the moisture condenses on the walls and eventually runs back into the source of water. A more familiar example occurs in a hot shower. The water evaporates into the air and creates steam. If there is no movement of air created by a fan or open window the water will quickly condense on the mirror. If there is an exhaust fan on, this wet air will be moved out of the room and the mirror will not fog up as quickly.The higher the speed of the wind the faster it moves drier air over the water.In the shower example, if the exhaust fan is powerful enough to pull the moist air out of the room quickly, the mirror may never fog up. However, if the air is already at 100% relative humidity, the wind speed won’t impact the rate of evaporation, as the air is already full. In the example of the shower, if the surrounding air is already at 100% humidity, the mirror will fog up immediately, regardless of how strong the exhaust fan is running. Humidity is one of the other variables that can affect evaporation.

Hope it helps you!Thanks!

Answer 2

Answer:

Humidity is nothing but saturation of atmosphere with water vapour(molecules). More humid is the air,more water it contains. So with more humidity the water intake capacity of air decrease i.e.it gets more saturated. Evapouration is the process by which extra water vapour is added to atmosphere. So naturally with more humidity the evapouration rate decreases. Humid air adds an extra pressure on water reservoirs, which in turn helps the surface molecules of the reservoirs to stay in contact with rest of the molecules. 

Now, at a fixed temperature air has a fixed humidity (saturation) level. So if temperature changes,so will the humidity and evapouration. Read a thermodynamics book for more specific interpretation.

2.

Approximately 80% of all water that falls as precipitation comes from water that evaporated from the ocean. The speed of wind is an important factor in the rate of this evaporation because the wind moves humid air away and pulls in drier air, thus increasing the rate of evaporation. The walls inside a cave where there is water are an example of the affect of the absence of wind. The walls in a cave that hold a stream or pool of water will be wet all the time due to condensation of water out of the air. Wind doesn’t move the wet air out of the cave so it continues to absorb water until it can’t hold any more. Once the air reaches saturation, the moisture condenses on the walls and eventually runs back into the source of water. A more familiar example occurs in a hot shower. The water evaporates into the air and creates steam. If there is no movement of air created by a fan or open window the water will quickly condense on the mirror. If there is an exhaust fan on, this wet air will be moved out of the room and the mirror will not fog up as quickly.The higher the speed of the wind the faster it moves drier air over the water.In the shower example, if the exhaust fan is powerful enough to pull the moist air out of the room quickly, the mirror may never fog up. However, if the air is already at 100% relative humidity, the wind speed won’t impact the rate of evaporation, as the air is already full. In the example of the shower, if the surrounding air is already at 100% humidity, the mirror will fog up immediately, regardless of how strong the exhaust fan is running. Humidity is one of the other variables that can affect evaporation.

Hope it helps you!Thanks!

Explanation: