The main reason that hot air rises is because sinking cold air pushes it up. However, other things like mountain slopes can also cause hot air to rise.
When any substance is hot, its molecules are farther apart than when it is cold, reports History for Kids. This makes hot air less dense than cold air and lighter per cubed square foot. These air currents also create storms, including hurricanes and tornadoes. Hot air rising and colliding with cold air is what creates thunderstorms.
Cumulus clouds look like fluffy clouds. The University Cooperation for Atmospheric Research reports that cumulus clouds usually have a flat base and are sometimes only feet above the ground. These clouds typically grow upward and can grow into thunderstorms. Hot air rises, true, but that's not the whole story, because rising air also cools.
The initially hot air cools more and more as it rises, eventually getting cold. The hot air in the valley got hot in the first place because it was warmed by the ground. The ground is much better than the air at absorbing sunlight, so the sun warms the ground, which warms the air around it.
The hot air does rise, but it gives up its heat as it rises. That's because there's less air pressure at higher altitudes, and lower pressure makes that rising bubble of hot air expand. Weather science. August 20th, 0 Comments. Where do tornadoes come from?
Stratus clouds — A blanket of cloud — Weather science. August 20th, 15 Comments. What is snow? Weather — Earth science. What causes the seasons? Earth science. Karen Carr February 11, at am. Gravity pulls cold air down to the ground, so hot air goes up and cold air goes down. Emma March 20, at pm - Reply. Karen Carr March 20, at pm.
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