What happens to your lungs when you take a deep breath?
Slide 3
Pressure I. Pressure The result of a force distributed over an
area A. SI Unit = Pascal (Pa) *1 Pascal = Newton/meter 2 1. A
Newton is a measure of force 2. (Meter) 2 is a measure of area 3.
1000 Pa = 1 kPa
Slide 4
Pressure B. The pressure in a closed container of gas is caused
by collisions between the particles of a gas and the walls of the
container 1. The speed and frequency of collision have a direct
affect on pressure 2. As speed increases the pressure increases, as
speed decreases the pressure decreases 3. The mass of the particles
also affects the pressure
Slide 5
Factors that Affect Gas Pressure A. Temperature 1. Raising the
temperature of a gas will increase the pressure if the volume of
the gas and number of particles are constant 2. As the temperature
rises, the average kinetic energy of the particles in the air
increases 3. With increased kinetic energy, the particles move
faster and collide more often with the walls of the container
Slide 6
Slide 7
B. Volume 1. Reducing the volume of a gas increases its
pressure if the temperature of the gas and the number of particles
are constant 2. As the volume is decreased, particles of trapped
air collide more often with the walls of the container
Slide 8
C. Number of Particles 1. Increasing the number of particles
will increase the pressure of a gas if the temperature and the
volume are constant 2. The more particles there are in the same
volume, the greater the number of collisions and the greater the
pressure
Slide 9
Charless Law A. States that the volume of a gas is directly
proportional to its temperature in Kelvin if the pressure and the
number of particles are constant B. Absolute zero the temperature
of 0 K or -273C
Slide 10
C. The formula equals 1. Temperature must be written in Kelvin
(add 273 to temperature in written in Kelvin (add 273 to
temperature in Celsius to get Kelvin) Celsius to get Kelvin) D. As
a gas cools to temperatures near 0K, the gas changes to a solid,
liquid, or sometimes a Bose-Einstein condensate
Slide 11
Charless Law
Slide 12
Boyles Law A. The volume of a gas is inversely proportional to
its pressure if the temperature and the number of particles are
constant. B. The formula equals P 1 V 1 = P 2 V 2
Slide 13
Boyles Law
Slide 14
The Combined Gas Law A. Describes the relationship among the
temperature, volume, and pressure of a gas when the number of
particles is constant B. The formula equals C. Scientists need laws
to deal with situations in to deal with situations in which
multiple variables which multiple variables are changing are
changing V2V2
Slide 15
D. What will happen to the volume of a weather balloon as it
rises through the atmosphere? 1. A decrease in pressure should
cause the balloon to expand to a larger volume 2. A decrease in
temperature should cause the balloon to contract to a smaller
volume 3. Whether the balloon expands or contracts depends on the
size of the changes in pressure and temperature