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Q: What should be the shape of an ideal thermometer and why?
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What should bethe shape of an ideal thermometer?

spherical


What precautions should you take while using a laboratory thermometer?

The thermometer should be kept upright not tilted. 2.) The bulb of the thermometer should be surrounded from all sides by the substance of which the temperature is to be measured. 3.) The bulb should no touch the surface of the container.


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.


Why a thermometer contain mercury not the other liquid?

because mercury has a very very cold freezing point which makes it ideal for measuring temperatures that you're likely to encounter on earth.


How can you tell if a thermometer is accurate or not?

Place it in ice water. It should read 32°.

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