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20 08, 2017

Why does earth have weather? – Earth Science

By |2017-08-20T17:40:27-07:00August 20th, 2017|Physics|0 Comments

A thunderstorm in South Africa The weather on Earth happens because of the evaporation and condensation of water, and because of the spinning of the earth and the tilt of the earth on its axis. Does it seem strange that such quiet things could cause big thunderstorms and huge waves and blizzards? Here's why. Because the Earth is tilted on its axis, [...]

20 08, 2017

What causes wind (Hot air rises) – Wind and weather Science

By |2018-09-19T08:16:28-07:00August 20th, 2017|Physics|7 Comments

Hot air balloon - hot air rising is what causes wind Hot air is lighter than cold air When something is hot, its molecules are farther apart than when it is cold. When air is hot, its molecules are further apart, so it takes up more room. That makes hot air lighter than cold air, because the [...]

20 08, 2017

Kleenex balloon – Hot air rises project

By |2018-05-31T11:49:22-07:00August 20th, 2017|Physics|0 Comments

Making your own hot air balloon (Thanks to American Aircraft Modeler) You can make your own tiny hot air balloon to see how hot air rises and then cools down and sinks again. Take a Kleenex tissue or some toilet paper and glue the edges to a circle of light string with tiny [...]

9 06, 2017

What is Kongming’s Light? – Ancient China project

By |2018-04-18T18:18:12-07:00June 9th, 2017|China, Crafts, Science|0 Comments

Kongming's Light, made by kids at Laurelhurst School, Portland Oregon Scientists in China were early leaders in the investigation of hot air and how you could use the fact that hot air rises to lift things off the ground. One early experiment, reported by the Chinese book Ten Thousand Infallible Arts of the [...]