no its just vapor of water if its mixed with another element then yes
You breathe out more water vapour then when you breathe in
Yes.
On exhaling carbon dioxide is breathed out along with water vapour.
About a pound
Because its part gas and we breath in oxygen
Because its part gas and we breath in oxygen
You can see water vapour in the air, as when a kettle or pan boils, or when you breathe out into cold air. It depends on the temperature balance between the vapour and the surrounding air.
Yes They are mammals and have about as much water in their bodies as humans. When they breathe they almost definitely breathe out water vapour. They must drink water at some stage or they will expire.
The air that you exhale contains water vapour. When you exhale during a cold day, the relative humidity increases. Relative humidity is actually the percentage of the amount of water vapour in the air.(the maximum amount of water vapour that the air can hold at that temperature) The colder the air, the less water vapour it can carry. When exhaled, air mixes with cold air, the temperature of the exhaled air drops, but there is more water vapour. When the air becomes saturated, (relative humidity is 100%), the extra water vapour will condense, allowing you to see your breathe on cold days.
The water vapour in your warm breath condenses back into water on contact with the cold surface of the window.
Trace amounts of water vapour are also exhaled, alongside the carbon dioxide.
You can breathe in either. Given a normal environment both hot and cold water will evaporate and become water vapour (change from a liquid to a gas). All else being equal the hot water will evaporate faster, but the cold water will still evaporate. For example, when you sweat, your sweat is not particularly hot, but it is the evaporation of the sweat that cools you down. You can therefore breathe in the water vapour from either hot or cold water. Just for absolute clarification - the above assumes the questioner is not asking if you can breathe under water; which clearly you can't unless there is something a little fishy about your character! :-)