What is its freezing point on the Fahrenheit scale? To convert celsius to farenheight we must multiply by 1.8 and addition 32, to convert farenheight to celsius we must substract 32 and then divide by 1.8. Then the required number of (thermochemical) calories is 100,000 thermochemical calories, or 418,400 joules (418.4 kJ). Since only an approximate answer is needed, though, simply bear in mind that the Kelvin and the Celsius scale have the same magnitude. The thermochemical calorie, in turn, is slightly smaller than the 15☌ calorie, the unit of energy required to raise the temperature of a gram of water from 14.5 to 15.5☌ at standard temperature. However, the most convenient unit for the purposes of calculation is the thermochemical calorie, which is equal to 4.184 J. The answer will have to be written in joules. This is of course the cliched E = m c 2 Īs such the units are equal on either side, as required.Īpproximately how much energy, in IS units, is needed to raise 1 liter (1 kg) of liquid water from 273.15°K to 373.15°K? (See the discussion of the calorie, Section 1-3.) What is the Einstein relation between mass and energy? Indicate the IS units of the terms in this relation. The essential distinction between these two forms of mass-energy is that matter moves at a velocity of less than the speed of light, and that radiant energy moves at the speed of light. What is the difference between matter and radiant energy?
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