Question

1 Explain why you often find drops of water on
the outside of a can of cold drink.

2 a Why doesn't water vapour condense inside
your lungs?

b Why can't you see your breath on a warm day?

3 a The trails behind aeroplanes are sometimes
called 'contrails. Why do you think they are
called this?

b Some people call them 'vapour trails: Why is
this name not correct?
Plz answer them and
NO IRRELEVANT ANSWERS ​

Answer 1

1. Condensation can also produce water droplets on the outside of soda cans or glasses of cold water. When warm air hits the cold surface, it reaches its dew point and condenses. This leaves droplets of water on the glass or can. When a pocket of air becomes full of water vapor, clouds form

2. However if the air temperature rises above body temperature and the ABSOLUTE humidity rises above the saturation amount of body T inhaling such air will cause water to condense in the lungs eventually causing one to drown in the air. ... It doesn't condense in the lungs.

3. We all know that the main gas we breath out is carbon dioxide but we also breath out a little bit of oxygen as well as water vapor too. Your breath is not visible on hot days, because the warm air supplies enough energy to the water vapor to keep it in a gaseous state and warm air can hold more moisture

4. Jets leave white trails, or contrails, in their wakes for the same reason you can sometimes see your breath. The hot, humid exhaust from jet engines mixes with the atmosphere, which at high altitude is of much lower vapor pressure and temperature than the exhaust gas

5. Contrail, also called condensation trail or vapour trail, streamer of cloud sometimes observed behind an airplane flying in clear cold humid air. A contrail forms when water vapour produced by the combustion of fuel in airplane engines condenses upon soot particles or sulfur aerosols in the plane's exhaust.