11/18/20101Cryogenic HistoryA story of people intertwined byCuriosityNecessityIndustryIdeal and not-so-Ideal GasesBoyle (UK)-1662 & Mariotte (FR)-1676Ideal Gas Law: P V= constantAmontons-1702Absolute Zero—Temperature at which Pressure goes to zeroat fixed VolumeAlso proposed Theory of FrictionAmontonsThermometry•Daniel Gabriel Fahrenheit (1686-1736) •German physicist •invented alcohol thermometer (1709)•Hg thermometer in (1714)•Introduced temperature scale -Fahrenheit Scale-in 1724. Celsius Scale-1742•On Fahrenheit scale, two very significant things for humans happened at two very insignificant points. The temperature at which water freezes is at 32 degrees and the temperature at which water boils is at 212.•Why did Mr. F. do this?•Why not, Celsius thought, simplify things a bit and call the freezing point zero and the boiling point 100.Anders CelsiusWilliam Cullen-University of Glasgow (UK) obtained ice by evaporation of water in vacuoFirst method of artificial refrigerationFirst artificial production of ice-1748
This preview has intentionally blurred sections.
Sign up to view the full version.