An Perfect Introduction for the chapter heat (7th class). It is actually for PBL (project)
Answers
★ HEAT ★
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★ The measure of degree of hotness of an object - Temperature
★ Temperature is measured b a device called thermometer.
★ Normal human temperature is 37°C.
★ Our body temperature is measured by clinical temperatures. It's range is from 35°C to 42°C.
★ Laboratory thermometers are used to measure the temperature of other objects. It's range is from -10°C to 110°C.
★Three processes by which heat flows from a body at a higher temperature to a body with lower temperature are :
✪ Conduction - The transfer of heat in solids.
✪ Convection - The transfer of heat in liquids and gases
✪ Radiation - For radiation, no medium is required.
★ Conductors - Materials that allow heat to pass through them easily.
★ Insulators - Materials that don't allow heat to pass through them.
★ Woolen clothes keep us warm during winter as wool traps air between fibers. It is also a poor conductor of heat.
★ Dark-colored clothes help us feel hot as it absorbs more radiation than light-colored clothes.
★Light-colored clothes help us feel cool as it absorbs less radiation than dark-colored clothes.
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★ HEAT ★
========
★ The measure of degree of hotness of an object - Temperature
★ Temperature is measured b a device called thermometer.
★ Normal human temperature is 37°C.
★ Our body temperature is measured by clinical temperatures. It's range is from 35°C to 42°C.
★ Laboratory thermometers are used to measure the temperature of other objects. It's range is from -10°C to 110°C.
★Three processes by which heat flows from a body at a higher temperature to a body with lower temperature are :
✪ Conduction - The transfer of heat in solids.
✪ Convection - The transfer of heat in liquids and gases
✪ Radiation - For radiation, no medium is required.
★ Conductors - Materials that allow heat to pass through them easily.
★ Insulators - Materials that don't allow heat to pass through them.
★ Woolen clothes keep us warm during winter as wool traps air between fibers. It is also a poor conductor of heat.
★ Dark-colored clothes help us feel hot as it absorbs more radiation than light-colored clothes.
★Light-colored clothes help us feel cool as it absorbs less radiation than dark-colored clothes.