where does the water that drops down from the airconditioner come from?
458303
from the humidity  in the  air
252829
what's the heat source?
503794
They take excess moisture out of the air.  They pull in the air from one end, take out the wwater which collects in a tub (which needs to be emptied), and lets out drier air.
407211
The evaporation of the water removes some of the heat from the catneen and it's contents.
878042
As the temperature of a liquid increases, the less gas it can hold dissolved. If you set a cold glass of water on the counter, it contains dissolved air. That is what th fish breath, dissolved air. As it warms less air can stay dissolved, so it comes out of solution on the side of the glass.\n\nIt is not the H or O from H2O
547960
The water is in the form of a vapor or gas, like steam.  When the vapor becomes concentrated enough to form droplets, it turns to rain.
281054
Because it is water base and water will evaporates.
221103
There is water/gas cooling heat exchanger are started first to avoid overheating. There is some checking for Hydrogen which can mean a water leak into the core. The 3mile island problem is online. It explains what the operators did to worsen the problem and what could have been done in detail.\nTry Am Institute of Physics, Physics Today site.
747796
Because the air is so thin, it has so little heat that water cannot exist as a liquid.  In other words, thinner air means colder temperatures, but that's kind of oversimplified.
29645
It probably is evaporating from the top. The bubbles on bottom are just more visible.
21135
water on the ground, in oceans, lakes, etc. has enough energy to evaporate a little bit (all liquids have a "vapor pressure," which is higher the hotter it is).  eventually, there is too much water in the air at whatever air temperature it is, so the water re-liquifies and falls.  this can commonly happen when a warm front (warm air holds lots of water) is cooled by a cold front.
980701
In Denver. This is because at higher elevations there is less pressure in the atmosphere, so the water boils at a lower temperature.
300959
This is typically called a cloud chamber.  I built one many years ago as a science project.\n\nWhat you do is create a sealed chamber that in which the air is oversaturated with a fluid, typically water or alcohol.  Heavy charged particles pass through the chamber and disturb the super-saturated atmosphere, causing a vapor trail.  You can see the trail of the particles, you can't really identify or see the actual particle.
323686
evaporation , condensation
128595
Whatever is not sent via the transmission lines to users becomes heat, which is usually cooled using a fluid (eg,waater or air), depending on the type of plant, and released to the environment. This is the origin of "thermal pollution".
443544
To start with, the air and water would leak out of the station. The vacuum would not leak in.\n\nOnce the water droplets had passed through the hole, they would boil almost instantly into a gaseous form.  This conversion from liquid to water vapor would absorb a lot of heat (latent heat of vaporization) thus causing the temperature around the reaction to drop. This would have the potential to freeze some of the water before it has a chance to vaporize.
110991
The water comes from a point elevated far above the sink height (a reservoir in upstate NY).\n\nBecause its source is higher, the water will flow (downward)--even though the pipes might go 'up' a buiding. Its all about the conservation of energy laws you can learn about in physics.\n\nFrom the reservoir it is piped to the city, and it gets filtered and treated before it gets to the sink.\n\nThe sink valves hold it back until you open them, and let the force of the flow down your drain, where it goes out to the river.