Steve Melhuish

Steve Melhuish

Pressure in a Gas

Gas Pressure is created when gas particles collide with the walls of their container. The more often the particles collide with the walls, and the faster they are moving, the greater the pressure.

Demo

In this tutorial you will learn how to calculate the gas pressure in enclosed spaces depending on the containers volume.

Note-Some mobile devices may require you to tap full screen during playback to view video content.

The formula for this equation is written like this:

$pV = { \text K}$

Chilled practice question

Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed.

A gas in a sealed container has a volume of 12 m3. The pressure of the gas is 80 Pa. The volume of the container is increased and the pressure falls to 60 Pa. What is the new volume of the container ? The temperature of the gas remains unchanged.

Frozen practice question

Copy out the question and attempt to calculate the answer before watching the solution. Write down the equation and show all of your working, remember to add the units to your answer, this routine will guarantee you maximum marks in an exam. Mark your solution and correct if needed.

The volume of a gas is reduced from 10 m3 to 2.5 m3 . The original pressure is 200 Pa. Calculate the new pressure.

Science in context

Pressure in a gas is caused when gas particles collide with the walls of their container. The more often the particles collide with the walls, and the faster they are moving when they do this, the greater the pressure. This is why the pressure in a tyre goes up when more air is pumped in.

Millie’s Master Methods

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Wave Speed

Wave speed is given in meters per second (the number of waves that pass per second). Wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per second.

Demo

In this tutorial you will learn how to calculate the speed of a wave.

The equation for this calculation is written like this:

$v = { \text f \; \text x \; \lambda }$

Chilled practice question

Calculate the velocity of a wave with a wavelength of 6 m and a frequency of 50 Hz

Frozen practice question

Find the velocity of a wave which has a time period of 10 s and a wavelength of 24 m, you will need to calculate the frequency from the wave period equation first.

Science in context

Wave speed is given in meters per second (the number of waves that pass per second). Wave Speed = FrequencyWave length. Wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per second.

Millie’s Master Methods

Millie’s Magic Triangle

The ability to rearrange equations is the first step to successfully solve Physics calculations. Millie’s Magic Triangle Teaches you to be confident when transposing an equation allowing …
Start Learning

Calculation Master Method

Performing and mastering this routine will guarantee you maximum marks when solving Physics calculations. Calculation Master Class Top Mark Routine Applying this technique will ensure you gain …
Start Learning

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