Standard altitude-pressure tables allow mountaineers and ... For one thing, water molecules have less mass than other gas molecules in air; so as water vapor increases, the density of air decreases.

The molecules from all those gases stacked on top of each other form what scientists call atmospheric pressure, which is measured by the force of the air’s weight on Earth’s surface.

There are lots of great air pressure demonstrations around, but a leaky water bottle is one of the simplest. It looks impressive and costs almost nothing.

The water gas molecules will occupy all the space inside the can since the air molecules have been pushed out. The hot gas molecules are the same pressure as the air outside the can. When the can is ...

And the lower the air pressure, the harder it is to breathe. That's because the air is thinner the higher you go. The molecules are literally farther apart. So there are fewer oxygen molecules in ...

“The free part is optional.” Let’s talk about the science of why tires lose pressure during cold spells: When it’s cold outside, air molecules condense. Imagine what happens when a balloon ...

Air molecules colliding with a surface cause atmospheric pressure. Atmospheric pressure at sea level is about 101,000 Pa (101 kPa) but just 27,000 Pa (27 kPa) at the cruising altitude of a ...

There are longstanding beliefs that joint pain can predict weather changes. While scientific evidence remains mixed, shifts ...

The particles in a gas are moving very quickly in random directions. The speeds of the particles vary but, on average, they move quicker than they do in liquids or solids. This means that it does ...