The Gas Laws (With Exam Predictions) - GCSE IGCSE Physics

Everything You Need to Know About the Gas Laws for GCSE & IGCSE Physics in JUST 3 Minutes!

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It's physics revision time! So today we're showing you a complete explanation of the gas laws, focusing on how pressure, volume, and temperature interact in an ideal gas. These basic explanations are crucial to understand if you want to pass your GCSE & IGCSE physics exams AND scoop up the top marks.

All the content and worked examples here are based on real exam-style questions, so you KNOW these questions will likely pop up, including the exact formulas for Pressure Law and Boyle's Law - so watch and learn.


What You Will Learn:

✅ Boyle's Law: Explore the inverse relationship between pressure and volume at constant temperature. The Boyle's Law formula is P×V=constant - see it applied in practical scenarios like syringe operations in our worked examples and exam predictions.

✅ The Pressure Law: Learn how pressure increases with temperature at constant volume, using the formula P/T = constant. We'll show how this law is graphically represented through a line passing through the origin, indicating absolute zero.

✅ Worked Examples: Examine how a syringe's pressure changes when the plunger is pushed, applying Boyle's Law, and how temperature affects pressure.


After Watching This Video, You Will Be Able to:

✅ Apply Boyle’s Law and The Pressure Law: Calculate the effects of altering volume and temperature on the pressure of an ideal gas in your exams.

✅ Interpret Graphs: You'll actually be able to analyse graphs that demonstrate the relationships described by these gas laws, and we’ll show you the behaviour at absolute zero.

✅ Understand how the physical properties of gases change under different conditions.

🧠 Top Facts To Remember:

🧠 Boyle's Law Equation is P×V=constant. If the volume of gas decreases, the pressure increases, assuming temperature is constant.

🧠 Pressure Law Formula is P/T = constant. This shows that pressure is directly proportional to temperature when volume doesn’t change.

Worked Examples in This Video based On exam Predictions:

🔹 We'll examine a practical scenario involving a syringe to demonstrate Boyle's Law. See how pushing the plunger affects the gas volume inside the syringe, increases pressure, and results in resistance felt on the finger, all while the temperature remains constant. This is important because this question or similar physics exam questions like this will likely come up in your GCSE & IGCSE Physics exams, based on past papers and exam predictions

🔹 We'll also show you the relationship between pressure and temperature using graphical data to show how pressure increases with temperature at a constant volume, validating the Pressure Law, and discussing the implications at Absolute Zero temperatures.

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Chapters:
0:00 What you’ll learn
0:03 Pressure & Volume - Boyle’s Law Explained
0:39 Exam tip #1
0:47 Pressure & Temperature
1:33 Pressure & Volume Exam Worked Example
2:39 Exam tip #2
2:54 Summary of the 2 Gas Laws

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