Matter and Energy. Principles of Matter and Thermodynamics by Fleisher P.

By Fleisher P.

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When the energy runs out, the machine stops. The same rule is true for living things. Plants get the power they need to live and grow from the sun’s energy. Without that energy supply, plants will die. They cannot produce their own energy. Animals must eat food to supply themselves with energy for life. They too will die if their energy supply runs out. Energy can neither be created nor destroyed. So the energy of any system, machine, or creature must balance out in the end. No energy can be lost or gained.

It can take the form of heat, light, electricity, kinetic energy (movement), chemical energy (like the energy in coal, gasoline, or food), or nuclear energy. The law of conservation of energy tells us 36 A moving cue ball transfers its kinetic energy to a second ball as it strikes it. 37 The First Law of Thermodynamics that energy can be converted from any of these forms to any other form. It is still energy, and none of it disappears when it is converted. In the 1700s, scientists were not sure that heat was a kind of energy.

His early years were rather rocky. When (1834–1907) his father went blind, Mendeleyev’s mother ran a glass factory to support their large family. A few years later, his father died and the factory burned down. Despite these troubles, Mendeleyev was an excellent student and went to Saint Petersburg to study chemistry. Later, as a university professor, he was dissatisfied with available chemistry textbooks. He decided to write his own, which became a classic. Mendeleyev’s greatest achievement came about almost by chance.

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