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Q: Why are the marks on a thermometer evenly spaced?
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How do you tell how hot or cold something is?

use a thermometer.We can feel how hot or cold something is. However, sometimes things are just too hot or cold for us to feel safely. At other times we need to know exactly how hot or cold something is. When we need to measure temperature correctly we need to use an instrument called a thermometer. This measures temperature in degrees Celsius [sometimes called centigrade] or degrees Fahrenheit. There are different types of thermometers for different situations. A medical thermometer, for example, needs to be very accurate. It measures in fractions of degrees. When we are ill, even tiny changes in temperature are important. Some thermometers use a liquid that moves up a very fine glass tube. Most room thermometers, and outdoor thermometers are like this. The liquid is either mercury [ which is poisonous] or coloured alcohol. As liquids get warmer they expand [get bigger], and move up the tube. Water expands too, but not as much as alcohol and mercury. Thermometers that might be used by small children are not made of glass. They use a digital display which lights up the temperature. Inside the displays are chemicals that change colour according to the temperature.


How did Anders Celsius invent the Celsius thermometer?

He used the "degree" as the unit of temperature. He based his standards for comparison on the properties of water, the most abundant liquid on Earth. Celsius assigned zero degrees to the temperature at which ice melts at sea level. He assigned a value of one hundred degrees to the temperature at which liquid water boils at sea level. Then he separated the region between these temperatures into 100 evenly spaced units or degrees.


Why is it easier to carry the same amount of water in two buckets one on each hand than in a single bucket?

The weight is spaced out more evenly than it would be if you had to carry a single bucket.


What instrument measures how hot or cold something is?

A thermometer is an instrument that measures cold and heat, together with temperature variations.


Who is the inventor thermometer?

thermometer

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