Temperature
Physics · तापमान · 12 facts
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Temperature: measure of hotness/coldness; average KE of molecules
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Three scales: Celsius (C), Fahrenheit (F), Kelvin (K)
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F = (9/5)C + 32; K = C + 273.15
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Water freezes at 0C=32F=273K; boils at 100C=212F=373K
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Absolute zero = 0K = -273.15C; lowest possible temperature
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-40 degrees is same in Celsius and Fahrenheit (-40C = -40F)
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Clinical thermometer: range 35C-42C; kink prevents mercury falling back
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Normal human body temperature = 37C = 98.6F
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Kelvin is SI unit of temperature; no degree symbol used
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Mercury thermometer: -39C to 357C; alcohol for lower temperatures
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Pyrometer: measures very high temperatures (>1000C) without contact
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Thermocouple: two different metals at junction measure temperature