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Stratus clouds – A blanket of cloud – Weather science

By |2019-02-11T13:47:05+00:00August 20th, 2017|Physics|

Stratus clouds (thanks to NASA) What are stratus clouds? If you see stratus clouds, that's the time to get inside and stay there. Stratus clouds mean rain if it is warm and snow if it is cold. They look like a huge gray blanket that hangs low in the sky. Sometimes stratus clouds are on the ground or [...]

Why does it rain? Weather – Earth science

By |2017-08-20T18:07:53+00:00August 20th, 2017|Physics|

Thanks to Rocbike for the great picture! When the Earth first formed, about 4.5 billion years ago, it didn't rain here. Until about four billion years ago, Earth was too hot for raindrops to form, and water just hung in the air as steam without falling as rain. Then as the Earth's surface began to cool, in the Archaean era, huge clouds formed and began [...]

What makes thunder and lightning? – Weather science

By |2018-04-24T15:20:20+00:00August 20th, 2017|Physics|

A bolt of lightning in the sky Hot air and cold air are constantly moving around the Earth, as the hot air rises and the cold air sinks - that's what makes wind. Sometimes as this airmoves around, it gets more exciting than just wind, though. A thunderstorm begins when the wind picks up a lot of water from the [...]

Why does earth have weather? – Earth Science

By |2017-08-20T17:40:27+00:00August 20th, 2017|Physics|

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, [...]

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

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

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 [...]

Thermometer projects – Temperature science

By |2018-05-31T11:49:18+00:00August 20th, 2017|Physics|

See how the degrees match up. To prove to yourself what temperature water freezes and boils at, fill a pan with ice from the freezer. Stick a thermometer in it (not a fever thermometer! Use an outside thermometer for the freezing part and a candy thermometer that goes up as high as boiling water for the boiling part) [...]

du Chatelet light project – European science

By |2018-04-08T11:14:26+00:00August 6th, 2017|Modern Europe, Science|

Any desk lamp will do You can get colored lights and thermometers and do the experiment that du Chatelet never carried out. See for yourself whether red light will heat things up more than blue light! Get a regular weather thermometer, and set it up under a strong desk lamp so the light shines [...]

Temperature – Fahrenheit and Celsius

By |2017-08-20T23:33:25+00:00July 6th, 2017|Environment, Physics|

See how the degrees match up. Many hot things take up more room than the same things when they are cold. Thermometers take advantage of that to measure heat. The old-fashioned kind of thermometer you see here is a narrow glass tube with a glass ball or bulb at the bottom. Inside the glass is a little bit [...]