Key relationship
P=nRT/V; PV=constant at fixed n,T.
Physics · Practical apparatus
Boyle-law gas syringe
Compress a sealed syringe slowly while holding temperature fixed. Its absolute pressure rises as volume falls; the PV product remains constant.
Open the interactive experiment →Boyle-law gas syringe
நிலையான வெப்பத்திலும் வாயு அளவிலும் PV மாறாது. கனஅளவு பாதியானால் அழுத்தம் இரட்டிப்பு.
Key notes, relationships and model limits
Practical tip
Compress a sealed syringe slowly while holding temperature fixed. Its absolute pressure rises as volume falls; the PV product remains constant.
Common trap
Boyle’s law keeps temperature and gas amount fixed. Use absolute pressure, not just gauge pressure.
Model limits
ideal gas, slow isothermal compression, absolute pressure. Real syringe friction, dead volume and temperature transients excluded.
What you will learn
Adjust boyle-law gas syringe apparatus, observe its reading and derive the indicated physical quantity.
Try the experiment
Try both scenarios, change one control, and predict the result before checking the graph and readouts.
Think of it this way
Change one input while keeping the others fixed, as you would in a controlled experiment.
Worked example
For n=0.005 mol, T=300 K and V=250 mL, P≈49.89 kPa and PV≈12.47 J.
Why this matters
The model connects boyle-law gas syringe with an observable reading. Check the equation and assumptions before applying it.
Before you start
SI units · algebra · graph reading
Check your understanding
Halving volume at fixed gas amount and temperature makes absolute pressure?
- Half as large.
- Twice as large.
- Unchanged.
Read the explanation
Twice as large.
Course connection: Virtual apparatus preparation. Check exact board/exam membership in the syllabus sources. Physical practical work remains necessary.