what are the disadvantage of mercury in thermometer ?
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Disadvantages. It is highly toxic for living beings and the environment if the bulb breaks and mercury leaks out. Mercury is difficult to clean, and it can contaminate the surface on which it leaked. It cannot measure cold temperatures.
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The disadvantages of mercury as thermometric liquid are: i) its temperature coefficient of expansion is very low and it cannot be used to measure the temperature below –39°C and above 357°C. ii) Mercury thermometer cannot be used in very cold regions like arctic regions because it freezes below a temperature of 39o C.
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