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For temperatures, zero is an arbitrary reference point, depending on which scale is used. For Celsius, zero is assigned the the temperature at which water freezes. So temperatures which are colder than this temperature will be negative values, and temperatures warmer will be positive values. Fahrenheit uses a different reference point for zero, but similar principles apply.
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What is Mercury thermometer use to measure?
A mercury thermometer is used to measure temperature.
How do you measure a Celsius?
Use a thermometer.
Where can you use integers at?
Every aspect of mathematics depends upon integers, and even if you don't do any mathematics, you count things with integers. If you even want to know how many guests you are having for dinner, you need to use integers.
How can you use integers to reprsent the speed and velocity of an object?
You can sometime use integers but often speed or velocity can also be irrational.
Do pilots use integers?
Yep.
