Extra Material: The Equations Behind the Words
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It is usually more convenient to use metric units (technically the International System of Units or SI). A brief list of some of the more useful units is given in Table 12.1. A meter is about a yard long, a liter is about four cups, and a raisin weighs about a gram. Water boils at 373 Kelvin, room temperature is about 293 Kelvin, water freezes at 273∘ Kelvin, and the remnants of the Big Bang explosion are now at about 3 Kelvin. Nothing can be colder than absolute zero, which is 0 Kelvin.