SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hot air rises in a thermometer
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Thermometers are magic
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The liquid expands when heated
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Heat is changing a solid to a liquid
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Detailed explanation-1: -Which of the following explains why the level of the liquid rises in the thermometer? Heat can change a solid into a liquid. Hot air rises inside the thermometer.
Detailed explanation-2: -The liquid in the thermometer goes up when the thermometer is heated because heating makes the alcohol molecules of the liquid move faster. The extra speed of the molecules competes with their attraction for one another and causes them to move slightly further apart.
Detailed explanation-3: -The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes.
Detailed explanation-4: -Hence, mercury expands when heated, thus when it comes into contact with a hot object, it’s level in the capillary rises.
Detailed explanation-5: -For a laboratory thermometer, reading should be taken while it is still immersed in the liquid you are measuring the temperature. Else the mercury level will change, hence giving an inaccurate reading.