Steam with water/neem and virus by eyes of Dr. Zeeshan Qaiser.

KARACHI -- Steam is water in the gas phase. It is commonly formed by boiling or evaporating water. Steam that is saturated or superheated is invisible; however, "steam" often refers to wet steam, the visible mist or aerosol of water droplets formed as water vapour condenses.

When water is heated it evaporates, which means it turns into water vapor and expands.

At 100 it boils, thus rapidly evaporating.

And at boiling point, the invisible gas of steam is created.

The opposite of evaporation is condensation, which is when water vapor condenses back into tiny droplets of water.

When water turns into steam, it is generally called 'boiling'.

In this case, the gaseous state immediately above the liquid state is close to 100% water.

The other term, evaporating, is when the gaseous state above the liquid is predominantly something other than water vapor.

When water is heated it evaporates, which means it turns into water vapor and expands.

At 100 it boils, thus rapidly evaporating.

And at boiling point, the invisible gas of steam is created.

The opposite of evaporation is condensation, which is when water vapor condenses back into tiny droplets of water.

DISCUSSISON: Evaporation happens fastest when water is heated to 212AdegF (100AdegC).

This is the boiling point of water.

When water is boiling, we call the hot water vapor steam.

When steam or water vapor cools down, it turns back to liquid water.

In general, a vapour refers to the gas phase of a substance below critical temperature.

Steam in general refers to the gas phase of water.

Steam can be the same as water vapour in some contexts.

In more casual usage, steam can refer to the mixture of vapour and aerosol liquid water droplets suspended in the vapour.

Now researchers at Rice University believe that they have found a completely new way for generating steam by placing light-absorbing nanoparticles in water and focusing...