3.3.1 Gas Pressure

• What is gas pressure defined as?

  Force per unit area
• Gas pressure is measured in units such as pascals (Pa) or atmospheres
• Gas pressure increases when particles collide with the container walls more frequently or with greater force.
• Match the factor with its effect on gas pressure:

  Temperature ↔️ Higher temperature increases pressure

  Number of Particles ↔️ More particles increase pressure

  Volume of Container ↔️ Smaller volume increases pressure
• How do faster particles affect gas pressure?

  Collide with greater force
• More frequent collisions of gas particles with the container walls lead to higher pressure
• Higher temperature, more particles, and smaller volume all contribute to faster and more frequent collisions, increasing gas pressure.
• Order the three main factors affecting gas pressure from most to least direct impact:

  1️⃣ Volume of Container

  2️⃣ Number of Particles

  3️⃣ Temperature
• What happens to gas pressure when the temperature increases?

  Increases due to higher KE
• More particles in the container increase the frequency of collisions
• A smaller volume of the container leads to more frequent collisions and higher gas pressure.
• Match the factor with its effect on gas pressure:

  Temperature ↔️ Higher KE, more forceful collisions

  Number of Particles ↔️ More particles, higher collision rate

  Volume of Container ↔️ Smaller volume increases frequency
• What is the effect of faster particle motion on gas pressure?

  Increases collision force
• Higher kinetic energy of gas particles results in stronger collisions
• Smaller volume and more particles both contribute to faster and more energetic particle motion, increasing gas pressure.
• The pressure of a gas is directly related to the motion of its particles
• Faster-moving gas particles increase gas pressure due to more forceful collisions
• Higher temperature increases particle kinetic energy, leading to more forceful collisions
• More frequent collisions of gas particles with container walls increase gas pressure
• What are three factors that affect gas pressure?

  Temperature, particles, volume
• Match the factor with its effect on gas pressure:

  Temperature ↔️ Increases kinetic energy

  Number of Particles ↔️ Increases collision frequency

  Volume of Container ↔️ Decreases particle space
• Boyle's Law states that at constant temperature, the pressure of a gas is inversely proportional to its volume
• According to Boyle's Law, as pressure increases, volume decreases at constant temperature
• What is the mathematical expression of Boyle's Law?

  P_{1}V_{1} = P_{2}V_{2}</latex>
• In Boyle's Law, $P_{1}$ and $P_{2}$ represent initial and final pressures
• Boyle's Law is valid only when the temperature of the gas remains constant
• If $P_{1} =$$2$ atm and V_{1} = 5</latex> L, and $V_{2} =$$10$ L, then $P_{2} =$$1$ atm
• Steps to solve a Boyle's Law problem

  1️⃣ Apply the formula: $P_{1}V_{1} =$$P_{2}V_{2}$

  2️⃣ Rearrange the formula to solve for the unknown variable

  3️⃣ Substitute the given values

  4️⃣ Calculate the final answer