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the density of a gas relative to the density of hydrogen
Water Vaper forms when liquid water evaporates.
Gas is invisible because of the substances it has comined with. Not all gases are invisible. Some are poisionis and some are harmless. Gas can be of just water vaper. If the gas molecules combine into a larger size they may fall and it would not be called a gas substance any more.
Precipitation does not start as anything. It is cycle. For example you do not know what side of your tire hit the ground first, all you know is that you get to where you want to go in a car. Same with the water cycle, you get what you need from water and do not think much of it. Unless, when the world was created, someone/something kept track we do not know.
Water vaper (humidity), carbon dioxide, methane and other small amounts of gases keep the Sun's heat all around us. If that did not happen, Earth would be unbearably cold at night. Most life could not live in that extreme cold. So, the answer is, carbon dioxide emissions keep you from freezing to death! But the Earth is always in climate cycles - very, very slow cycles. In the 1500s, the Earth was in a very, very cold climate that is now called the Little Ice Age. As we to this day recover from the Little Ice Age, the Earth's average temperature has increased a little, although in the 1950s and 1960s there was a scary period of global cooling, and most everyone was hollering, "We have to do something, or it will be too late. People then called for the government to "do something" before we all froze into a solid block of ice and San Francisco was hundreds of feet above the ocean. One idea that almost actually happened was to spray black pigment from planes and helicopters on the north and south poles so they would heat up more and melt. Seems funny, now, doesn't it? And so will global 'warming' seem funny in 15 or 20 years when England freezes over due to a (predicted) change in the warm Gulf Current that currently warms England.
you can change liquid water to water vapo by putting the water in a pot and heating up the water then when the boiling is done you will see the water vaper on the cover and that how you change the liquid water to water vaper
Evaperation. Thats the prosses that happens when you change a liquid to an Vaper. Glad to help :)
Condensation
Water Vaper forms when liquid water evaporates.
Air and cloud vaper
water vapor is a gas
Only the Troposphere has high levels (only 20% however) to suport life, but water vaper is found in all levels of the Atmosphere. But, when Evaperation mixes the water vaper found close to earth with the water in the Troposphere, it condesnes into a cloud before the vaper could have reached the outer layers.
the density of a gas relative to the density of hydrogen
A a liquid
no. hot water is the liquid form. Water vapour is the gas form of H20.
No planet in our solar system has an atmosphere made largely of water vapor. There may be such planets orbiting other stars, but none have been conclusively found.
Water Vaper forms when liquid water evaporates.