CHEM 001 Lecture Notes - Lecture 6: Barometer, Ideal Gas, Pressure Measurement

• School: College of The Sequoias
• Department: Chemistry (CHEM)
• Course: CHEM 001
• Professor: guerra

Document Summary

The si unit of pressure is the pascal (pa): Torrs and standard atmospheres (atm) are not standard units. The first barometer was a tube of hg inverted into a bowl. At sea level, the hg column is 760 mm. Manometers measure gas pressure inside a flask relative to atmospheric pressure. P (gas) = p (atm) + h (if more pressure) P (gas) = p (atm) - h (if less pressure) Simple gas laws precede pv = nrt. One condition: two variables and a constant. Two conditions: before and after , no constant. At constant temperature and moles, the pressure and volume of a gas are inversely proportional. At constant temperature, the pressure of a gas increases as its volume decreases, b/c the gas particles collide with the container more. Gas pressure is a result of the particles striking their container. As pressure increases, the particles collide with the container more often (not hitting harder or moving faster)