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PP2022P1Q17 Why is the athlete wrapped with silver and white sheet after a run?
We have learned that silver smooth reflective surface is a poor absorber , poor emitter or a good reflector of infra-red radiation. How...
Evan Toh
Oct 30, 20241 min read
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Worse than black? Japan study on heat-beating shirt colors reveals infrared absorbers – The Mainichi
https://mainichi.jp/english/articles/20230726/p2a/00m/0sc/014000c Dull black is the best absorber and best emitter of infra-red...
Evan Toh
Oct 30, 20241 min read
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Pee Boy - Gas expands and contracts the most
The 3 states of matter –  solid, liquid and gas. In general, when a body is heated, it expands and volume increases. The mass remains the...
Evan Toh
Aug 31, 20242 min read
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Hand Boiler
Hand boiler toy is a demonstration of thermal transfer and how the 3 states of matter interact. The coloured liquid inside is usually...
Evan Toh
Aug 31, 20241 min read
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Water is a poor conductor
In the three states of matter, in general, solid is the best conductor as the particles are closely packed in an orderly manner, hence...
Evan Toh
Aug 31, 20241 min read
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Black is a good emitter of infrared radiation
In theory, we have learned that Dull (matt/rough) and black surface is a good emitter and good absorber of infrared radiation . In...
Evan Toh
Aug 31, 20241 min read
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Metal is a good conductor – paper over metal gets burned slower
he paper over metal or over plastic/wood will get burned faster? Everyone knows that metal is a good conductor of thermal energy. But...
Evan Toh
Aug 31, 20241 min read
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Convection Toy – Angels Carousel
This simple toy is made possible using convection current in the air. The ‘fan’ of the carousel is similar to the windmill we are...
Evan Toh
Aug 31, 20241 min read
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Convection Current – demo
Convection is a process in which thermal energy is transferred within a fluid (liquid or gas) due to the difference in density which...
Evan Toh
Aug 31, 20241 min read
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Radiometer – Thermal Transfer
adiometer is a device for measuring the amount of infrared radiation. It consists of freely pivoted rotor with four vanes perpendicular...
Evan Toh
Aug 31, 20241 min read
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Fiery Re-entry into Earth’s Atmosphere
First astronauts launched by SpaceX returned home safely on 3 Aug 2020.
Evan Toh
Jan 1, 20241 min read
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Evan Toh
Dec 31, 20230 min read
88 views
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Evan Toh
Dec 31, 20230 min read
32 views
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