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Sources of heat can be divided into Natural and Unnatural sources of heat
Hot geyser
Sun
Hot Spring
An unnatural source of heat cannot produce heat on its own.
Candle Flame
Burning Coal
Matches
Burning Wood
Electric oven
Can be measured using thermometers and heat sensors
The unit of measurement for heat is degree celsius
Cannot measure the temperature of objects but can be used to sense if something is hot or cold
Used to measure temperature accurately
Causes a rise in temperature
Causes a drop in temperature
hotter to colder test