Abridged Science for High School Students. The Nuclear by H. Messel

By H. Messel

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We can explain the diffusion of gases if we assume that the gas particles are in rapid and violent motion, constantly colliding with one another and so being spread further apart. Diffusion of liquids. Do liquids diffuse? This is an obvious question to ask seeing that we are interested in this state of matter as well as in gases. In our study of diffusion of gases, we made some brown nitrogen dioxide by adding nitric acid to copper. You no doubt noticed the blue liquid which remained in the bottom of the beaker.

The earth in turn is a satellite of the sun. We could never lead a nice comfortable life 93 million miles away from the sun unless we were moving around it. If we were not moving sideways around the sun we would be drawn straight in towards it and would crash through its fiery surface within a matter of a few days. This disaster is avoided only because the earth is travelling around the sun at about 65,000 miles per hour, the speed required for it to be a satellite of the sun. The other planets also are moving around the sun at speeds which keep them in their orbits.

As you might expect, the stars in the Cross will move higher, and they will move more to the south, and the Cross will become more nearly upright as the night goes on. These stars follow the curved paths shown in the photographs; each of them swings up and around in the same direction, and in much the same way, as a point on one of the hands of a clock. Indeed, they move in very much the same way as do points on the hour hand of a clock, but at about half the rate. 3 The Southern Cross, Musca, Carina, and Chameleon.

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