CHEM 112 Lecture Notes - Lecture 8: Carran, Kelvin, Ideal Gas
13 Oct 2014
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Vapours: gaseous state of substances that ordinarily are liquids or solids, water is normally a liquid at room temperature. However, if some enters the air, which increases humidity, it is considered to be a water vapour: oxygen is considered to be a gas while gaseous water is water vapour. Four properties determine physical behaviour of gases: amount of gas (moles, volume of gas, temperature of gas, pressure of gas, gas pressure. Why: an enormous pressure is exerted to the surface of your skin by a needle using a weak force. Pressure is large in this example because the point of needle has such small contact area. A height of mercury of 760 mm corresponds to an atmospheric pressure of 760 torr, 101. 325 kpa or 1 atm. Pressure is force (f) divided by area (a) Because the volume of the liquid in any column is v = ah. Since density is = m/v, the above equation may be rewritten as.
