when cold and warm air are added in the same container it causes water.
It's condensation formed from the water vapour the surrounding air. The cold water absorbes the heat from the surrounding air, including the water in the air which then lacks the energy to remain as a gas and so forms a liquid droplet on the container.
Frost
When water is heated, water vapor forces the air out. When submerged in cold water, the water vapor condenses instantly, leaving a partial vacuum in the can, Atmospheric pressure (14.7 psi) acting on the outside of the can crushes the can before air can rush through the opening in the can to balance the pressure. Fun science experiment, just be careful not to get burned.
The cold glass cools the air close to the outside of the glass and causes the moisture in the air to condense on the outside of the glass when the molecules in the air come close enough together to touch one another..
The return hose or the cold line (different pipes) will both get very cold due to the operation of the Air Conditioner. This causes water to condense (condensation) on the portions that are cold, If the part is cold enough the water freezes into frost that you see.
Cold
when cold and warm air are added in the same container it causes water.
When looking at this use the equation PV = nRT. From this you can see that temperature and pressure are proportional to one another. So if your temperature increases for the same volume and number of moles your pressure must also increase. When you use a fire extinguisher you rapidly decrease the pressure inside the container which causes the temperature to decrease. The frost you see is water vapor from the air freezing when it comes into contact with the cold outside of the extinguisher.
when its really cold outside or after it's done raining
it'll get frost
Frost is related to condensation, so for the most part I will be reffering to condensation. But condensation forms on the outside of a cold object when the air around it is relatively humid. When air gets colder it cannot hold as much water vapor in it, so the air which is cold from the cold object has excess water in it that it needs to get rid of, depositing it somewhere, most likely the cold object. Frost is formed when the condensation freezes.
There is always vaporized water in the air. In cold temperatures, this gaseous vapor tuns into a liquid or solid. Dew in the morning is a result of cold temperatures at night and frost in the winter is from really cold temperatures outside
It's condensation formed from the water vapour the surrounding air. The cold water absorbes the heat from the surrounding air, including the water in the air which then lacks the energy to remain as a gas and so forms a liquid droplet on the container.
If the water is left outside in an open container it eventually will evaporate. If left outside during cold weather it could freeze.
It may need water or fertilizer. If you are in a cold climate and it is outside, it may have frost damage.
They mean that by implying its cold outside/inside comparing to where you are. Glad this helped :)