Evan Toh
Balloon at reduced pressure
A partially inflated balloon is placed inside a sealed container as air is pumped out of the by syringe. As the pressure of the container...
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Evan Toh
Nov 21 min read
Marshmallow Hulk in Vacuum Jar
When the pump is switched on and the air in the jar is gradually removed, the pressure in the jar decreases. There will be fewer air...
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Evan Toh
Nov 20 min read
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Evan Toh
Nov 21 min read
How to mark 2 points (at a distance apart) at the same level? (water finds its own level)
The video below demonstrates that water will find its own level. An question requires this concept: An apartment block receives water...
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Evan Toh
Nov 11 min read
Boiling water at reduced pressure – Water boils at 75 oC
At sea level (where most of us are), the standard atmospheric pressure is about 101325 Pa. The boiling point of water is at 100 oC which...
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Evan Toh
Dec 31, 20230 min read
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Evan Toh
Dec 31, 20231 min read
Pressure – Height of ethanol in the column
Answer: Option D
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Evan Toh
Dec 31, 20230 min read
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Evan Toh
Dec 31, 20231 min read
2 pistons of different pressure joined together - P1V1 = P2V2
Solution: Option C
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Evan Toh
Dec 31, 20232 min read
2013SPp2q9 – Pressure and Moment
Solutions: (a) (i) A bigger force than F can be obtained due to the lever system and hydraulic system . Lever system: Applying...
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Evan Toh
Dec 31, 20231 min read
2004PPp1q15 - Volume of bubble at bottom of lake (P1V1 = P2V2)
Answer: Option A Since the air bubble is enclosed, PV at A is equal to PV at B. PAVA = PBVB (Patm + Pwater) VA =...
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Evan Toh
Dec 31, 20231 min read
Barometer with a layer of water – Find height of mercury H
Answer: Option B
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Evan Toh
Dec 31, 20231 min read
When to use the concept PV = constant and P1V1 = P2V2 to solve?
When temperature is constant (for o-level), when a fixed mass of gas (fixed number of air molecules) is compressed in a closed system...
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Evan Toh
Dec 31, 20231 min read
Understanding Hydraulic System Overview
Refer to the video tutorial for the basic concepts of hydraulic system. The notes are attached below. Understanding Hydraulic System 01...
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Evan Toh
Dec 31, 20231 min read
Using barometer to estimate height of mountain
At sea-level, the barometer which Pie is holding reads 760 mm of Hg. When he is at the top of Mount Pie, the same barometer reads 230 mm...
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Evan Toh
Nov 30, 20231 min read
Sketching P-V, P-1/V and PV-P graph
Pressure of a fixed mass of gas, P, is inversely proportional to the volume of the gas, V, when the temperature is held constant. P...
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