What gas is water vapor?

Water vapor is a transparent, colorless, odorless, tasteless gas.

1. Water vapor

Water vapor (also called atmosphere, steam) is the gaseous form of water (H2O). When water reaches its boiling point, it turns into steam. Water vapor is colorless in air. At sea level and standard atmospheric pressure, the boiling point of water is 100°C or 212°F or 373.15K. Water can also slowly evaporate into water vapor when it is below its boiling point. In extremely low pressure environments, ice will sublimate directly into water vapor. The density of water vapor is 0.59764 kg/cubic meter.

2. Formation of water vapor

When the temperature of water exceeds 100 degrees Celsius (Or when it exceeds the boiling point), water molecules absorb sufficient internal energy pto convert it into a repulsive force that moves away from molecular constraints. The distance between the molecules begins to increase and the water changes from liquid water to gaseous water. . This sparkling water does not contain any other substances and is theoretically distilled water (the air contains impurities), also called water vapor. Water can also slowly evaporate into water vapor when it is below its boiling point.

3. What can water vapor change into?

Water can turn into rain, snow, fog, etc. Water absorbs heat and vaporizes into water vapor. If heated, thermal energy (chemical energy) is converted into internal energy. When water vapor releases heat and liquefies (condenses) into water (ice crystals), the internal energy is converted into thermal energy. It can liquefy in water or condense into ice.

The liquid phase can exist sous the form of a dispersed “mist” (water vapor is the gaseous form of water), or it can exist as a large number of aggregated droplets. , it must also meet certain physical and other environmental conditions. In practical applications, most exposures concern “water vapor”.

4. Precautions

As the most common energy medium, water vapor is widely used in power generation, heating and other related working conditions. The work is done by heating water and evaporating the steam.

When water is placed in a sealed container, some molecules escape from the surface while others return from the vapor space. At the same time, if the number of molecules escaping and returning to the water is the same and a dynamic equilibrium is reached, the water and water vapor will be in a state ssaturated, called respectively saturated water and saturated water vapor, and the corresponding pressure and temperature are called saturation pressure and temperature respectively. The higher the saturation temperature, the higher the saturation pressure.