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Evan Toh
Oct 301 min read
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...
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Evan Toh
Oct 301 min read
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...
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Evan Toh
Aug 312 min read
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...
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Evan Toh
Aug 311 min read
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...
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Evan Toh
Aug 311 min read
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...
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Evan Toh
Aug 311 min read
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...
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Evan Toh
Aug 311 min read
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...
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Evan Toh
Aug 311 min read
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...
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Evan Toh
Aug 311 min read
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...
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Evan Toh
Aug 311 min read
Radiometer – Thermal Transfer
adiometer is a device for measuring the amount of infrared radiation. It consists of freely pivoted rotor with four vanes perpendicular...
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Evan Toh
Jan 11 min read
Fiery Re-entry into Earth’s Atmosphere
First astronauts launched by SpaceX returned home safely on 3 Aug 2020.
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