Pressure F=ma Earth 9.8m/s 2 Moon 1.6 m/s 2 Weight: newtons, pounds SI unit of force is the Newton (N)

Pressure Pressure is a measure of force per unit area. Units for pressure include: atmospheres (atm), pascals (Pa), kilopascals (kPa), mm Mercury (mm Hg), and torr. atmospheres (atm)pascals (Pa) kilopascals (kPa)mm Mercury (mm Hg)torr.

Pressure unit A pressure unit that is equivalent to the pressure at sea-level.pressure 1 atmosphere (atm) = kPa = 101,325 Pa = 760 torr = 760 mm Hg.kPaPatorrmm Hg

Kilopascal (kPa) The kilopascal is a commonly used unit of pressure that is equal to 1000 Pa. pressurePa The kilopascal is more commonly used than the pascal because the pascal is such a small unit of pressure.pascalpressure kPa = 101,325 Pa = 1 atmosphere (atm) = 760 torr = 760 mm Hg.Pa atmosphere (atm)torrmm Hg

The molecules in a gas are in constant motion. The purple balls represent gaseous atoms that collide with each other and the walls of the container. Gas molecules are in constant motion. "Pressure" is a measure of the collisions of the atoms with the container Molecular motion in a gas

Collisions Pressure is proportional to the collision frequency of molecules against the walls of the container.

Pressure determines the direction of mass flow

Dalton's Law of Partial Pressures: The total pressure exerted by a mixture of gases equals the sum of the partial pressures of the individual gases. P (total) = P 1 + P 2 + P

The water column is on the inside: P ATM = P GAS + P WV + P WC

There is no water column: P ATM = P GAS + P WV

The water column is on the outside: P ATM + P WC = P GAS + P WV