![]() ![]() A large object also has more surface area to radiate heat away, but since surface area is proportional to radius 2 while the amount of heat-producing material is proportional to radius 3, making things bigger generally makes them hotter. ![]() The Sun is hotter than a reptile because it's so large-all that heat adds up. By volume, the Sun's core doesn't actually produce that much energy-a blob of core matter produces about the same amount of energy as the body heat of a reptile of the same size, A Wikipedia factoid also compares the Sun's heat-per-unit-volume to the heat produced by an active compost pile, although the energy production from compost varies with temperature-since a hot compost pile kills off the organisms that do the composting. Most of the Sun's mass is concentrated in the core, where energy is released as hydrogen fuses into helium. That's enough to tell us that we're going to have a hard time catching up with the Sun by eating more burgers. ![]() Of course, we immediately worked our way around to measuring stored energy in kWh (and mAh), and now everything is terrible again. This is a rare case of a common-in-America unit which is secretly SI-friendly. What percentage of the Sun's heat (per day) does the population of Earth eat in calories per year? What changes could be made to our diets for the amount of calories to equal the energy of the Sun?Ī McDonald's Big Mac contains 540 (dietary) calories of energy, or about 2,250,000 joules. ![]()
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