You know water evaporates – that’s when it turns from a liquid to a gas. You probably also know that a hot pot of water will cool off in part because of evaporation.

When water molecules do this, they change from liquid water to water vapor – a gas. This changing from a liquid to a gas is called evaporation. Heating a liquid causes the water molecules to move ...

Evaporation occurs when molecules in a liquid gain enough energy that they overcome attractions from other molecules and break away to become a gas. Adding energy increases the rate of evaporation. To ...

Evaporation and condensation are processes which can happen to liquid and gas. Find out more in this Bitesize KS2 Science Explainer.

Scientists at MIT have made the surprising discovery that light alone can evaporate water, ... the surface of the liquid absorb enough energy to escape into the air above as a gas – water vapor.

Water vapor is known to be Earth's most abundant greenhouse gas, but the extent of its contribution to global warming has been debated. Using recent NASA satellite data, researchers have estimated ...

“Water vapor is the most important greenhouse gas and natural levels of [carbon dioxide, methane and nitrous oxide] are also crucial to creating a habitable planet,” writes John Reilly ...

Transpiration is the evaporation of water from trees out and into the Earth's atmosphere. Leaf transpiration occurs through pores called stomata, and at a necessary "cost", displaces of much of ...

A new study is shedding light on why solar radiation is more effective than other forms of energy at causing water to ...

Under certain conditions, water can exist as a liquid and a gas at the same time, for example, in cloud formation: Depending on the temperature, water vapor in the air condenses into liquid droplets.