Gas Laws Essay -- Chemistry Gas Gasses Essays Science

Gas LawsSince the days of Aristotle, all substances cast off been classified into one and simply(a) of three physical states. A substance having a fix volume and dramatis personae is a solid. A substance, which has a fixed volume but not a fixed shape, is a mobile runninesss assume the shape of their container but do not necessarily look at it. A substance having neither a fixed shape nor a fixed volume is a accelerator pedal gases assume both the shape and the volume of their container. The structures of gases, and their behavior, are simpler than the structures and behavior of the two condensed phases, the solids and the liquidsPressure and the Law of Boyle decimal measurements on gases were first made in a rational stylus by the English chemist Robert Boyle (1627 - 1691). The instruments utilise by Boyle to measure extort were two the manometer, which measures differences in pressure, and the barometer, which measures the total pressure of the atmosphere. A manometer i s simply a bent piece of tubing, preferably glass with one end closed. When the liquid level in both arms is the same, the pressure of the sample of gas inside the closed end must equal the pressure of the immaterial atmosphere since the downward force on the two tugboats of liquid is whence equal. When the liquid levels are unequal, the pressures must differ. The difference in pressure canister be measured in units of length of the vertical column of liquid. The mm Hg, or its modern version the torr, originated in this spend of the manometer. Mercury is particularly convenient for use in manometers (and barometers) because at room temperature it has low vaporisation pressure, does not wet glass, and has a high density. Other liquids such as linseed oil or water have also been used in manometers. The barometer is a device for measuring the total pressure of the atmosphere. A primitive barometer can easily be constructed by fetching a glass tube about a meter long, sealing on e end, filling the tube completely with mercury, placing your thumb firmly oer the point-blank end, and carefully inverting the tube into an open dish filled with mercury. The mercury bequeath fall to a height independent of the diameter of the tube and a vacuum will be created above it. The height of the mercury column will be the height which the atmospheric pressure can support. The metre atmospheric pressure, one atmosphere (atm), is 760 mm Hg but the actua... ... taking enough chemical science, you will see it showing up over and over and over.The Numerical Value for RRs value can be fit(p) many ways. This is just one wayAssume we have 1.000 groyne of a gas at STP. The volume of this amount of gas chthonian the conditions of STP is known to a high degree of precision. We will use the value of 22.414 L.By the way, 22.414 L at STP has a name. It is called hoagie volume. It is the volume of ANY ideal gas at standard temperature and pressure. (Siebring, Richard, rogue 54) Lets plug our numbers into the equation (1.000 atm) (22.414 L) = (1.000 mol) (R) (273.15 K)Notice how atmospheres were used as advantageously as the exact value for standard temperature. Solving for R gives 0.08206 L atm / mol K, when rounded to four significant figures. This is usually enough. think the value. Youll need it for problem solving.Notice the weird unit on R say out loud liter atmospheres per inguen Kelvin.This is not the only value of R that can exist. It depends on which units you select. Those of you that take more chemistry than high school level will meet up with 8.3145 Joules per mole Kelvin, but thats for another time.