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What measurements are important when studying gases? Volume The amount of space that matter fills. Measured in cm3, mL, or L Since gas particles move and fill the space available, the volume of the gas is the same as the volume of its container.
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Science Starter
Write on a piece of paper: Setting (leave room to answer) Characters (leave room to answer) Action (leave room to answer)
Read the Red Herring story below and fill in the blanks. Then write down 3 yes or no questions to ask me to solve the mystery.
STORY – Out for a drive, he stopped for gas, but when he filled up, the fuel indicator never budged. Why not?
EQ: “How are the volume, temperature, and pressure of gases related?”
Gases Video
What measurements are important when studying gases?
Volume The amount of space that matter fills.
Measured in cm3, mL, or L Since gas particles move and fill the space
available, the volume of the gas is the same as the volume of its container.
What measurements are important when studying gases?
Temperature Temperature is a measure of the
average energy of random motion of the particles of a substance.
The faster the particles move – the greater the energy and the higher the temperature.
What measurements are important when studying gases?
Pressure Pressure of a gas is the force of its
outward push divided by the area of the walls of the container.
Measured in units of pascals (Pa or kPa) Pressure= Force Area Gas Volume & Pressure Video
Boyle’s Law
Boyle’s Law 1600’s, Boyle measured the volumes of
gases at different pressures. He found that when the pressure of a gas (at
constant temperature) is increased, the volume of the gas decreases. When the pressure is decreased, the volume increases.
This relationship between pressure and volume of gas is called Boyle’s Law
Boyle’s Law Video
Practice
A machine exerts a force of 252 N on a piston having an area of 0.430 m2. What is the pressure on the piston in Pa?
Pressure= 252N 0.430 m2 = 586 Pa
N= neutons (measures force)Pa=pascals (measures pressure)
Volume and Temperature
Jacques Charles (1700’s) found that when the temperature of a gas is increased at constant pressure, its volume increases.
When the temperature of a gas is decreased at constant pressure, its volume decreases.
This principle is called Charles’s Law Simple Gas Law Video
Pressure and Temperature
When the temperature of a gas at constant volume is increased, the pressure of the gas increases.
When the temperature is decreased, the pressure of the gas decreases.
SummarizerEQ: “How are the volume, temperature, and pressure of gases related?”
