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Systeme International base units (SI Units) LengthMeterm Massgramg VolumeLiterL TimeSeconds TemperatureKelvinK HeatJouleJ
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WrittenSymbolExponentialDecimal giga mega GMGM 10 9 10 6 1 000 000 000 1 000 000 kilok10 3 1 000 Base unit10 0 1 decid10 -1 0.1 centic10 -2 0.01 millim10 -3 0.001 micro Nano µNµN 10 -6 10 -9 0.000 001.000 000 001
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Heat - measure of the quantity or how much energy Temperature - measure of the intensity or how energetic each particle is
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Temperature Conversion K = °C + 273 °C = 5/9 (°F – 32) °F = 9/5 * °C + 32
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Density - The amount of mass per unit volume Density = Mass D = M Volume V
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Specific Gravity Numerically the same as density but has no units. It is still a mass/volume It is a comparision to water as the standard that has a density of 1.00 g/mL at 20 ºC If Lead has a density at 20 ºC of 11.35 g/mL It is 11.35 times more dense than water So the specific gravity for Lead is reported as 11.35
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calorie The amount of heat needed to raise the temperature of one gram of liquid water by 1 ºC
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1 kcal = 1000 cal 1cal = 4.184 J 1000 cal = 1 C (food calories)
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Specific heat The amount of heat (in calories) necessary to raise the temperature of 1 g of any substance by 1 ºC.
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Amount of heat = Specific heat x mass x change in temp Heat = SH x m x (T 2 – T 1 )
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