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by Anonymous on April 20th, 2008

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At what tempperature does water boil and at what temperature does it freeze?

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  • by iwnit on April 20th, 2008

    iwnit

    "From 1744 until 1954, 0 °C on the Celsius scale was defined as the freezing point of water and 100 °C was defined as the boiling point of water under a pressure of one standard atmosphere; this close equivalency is taught in schools today. However, the unit “degree Celsius” and the Celsius scale are currently, by international agreement, defined by two different points: absolute zero, and the triple point of VSMOW (specially prepared water). This definition also precisely relates the Celsius scale to the Kelvin scale, which is the SI base unit of temperature (symbol: K). Absolute zero—the temperature at which no energy remains in a substance—is defined as being precisely 0 K and −273.15 °C. The triple point of water is defined as being precisely 273.16 K and 0.01 °C."

    " Kelvin Celsius Fahrenheit
    Absolute zero

    (precisely, by definition)
    0 K −273.15 °C −459.67 °F
    Melting point of ice
    (approximate)
    273.15 K 0 °C 32 °F
    Water’s triple point

    (precisely, by definition)
    273.16 K 0.01 °C 32.018 °F
    Water's boiling point at 1 atm (101.325 kPa)
    (approximate)
    373.1339 K 99.9839 °C 211.9710 °F "
    Source and further information:
    http://en.wikipedia.org/wiki/Celsius

    The temperatures of boiling respectively freezing water could be different under different conditions.

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