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Why do we use mercury in thermometer can water be used instead of mercury?

We use mercury in thermometers because most metals are good conductor of heat and mercury is the only metal in liquid state. No,we cannot use water instead of mercury because water do not expand as per temperature given to it and can give us wrong reading.

What is used in thermometers instead of mercury?

Ethanol-filled thermometers are used in preference to mercury for meteorological measurements of minimum temperatures and can be used down to −70 °C (−94 °F). The physical limitation of the ability of a thermometer to measure low temperature is the freezing point of the liquid used.

What are the advantages of using mercury in thermometer?

Advantages of mercury: Mercury thermometers give accurate readings. Quick reaction to changes of temperatures because metal is a good heat conductor. Mercury has a very low saturation vapor pressure.

What are the advantages of using mercury?

Advantages of mercury as a thermometric liquid. -It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly. -It does not wet (cling to the sides of) the tube. -It expands uniformly (linear expansion) and responds quickly to temperature changes, hence is sensitive.

Which thermometer is better mercury or alcohol?

There is a technical reason for using mercury in clinical thermometers. Mercury has a greater coefficient of thermal expansion than alcohol. This means a column of mercury will expand and rise more than a column of alcohol for the same temperature change. As a result, you can get finer readings with mercury.

What are the advantages of mercury over alcohol?

It expands linearly and less than alcohol and any other liquid. It is more durable than alcohol thermometer because mercury does not evaporate easily. It is smaller in size as compared to alcohol one. Mercury does not wet the wall of the thermometer, which means that results can be highly accurate.

What are the advantages and disadvantages of mercury?

A thermometer comparison

advantages disadvantages
Mercury thermometer
cheap display is harder to read
durable does not work below -39 C (Hg freezing pount)
accurate cannot be used for thermograph

Does my thermometer contain mercury?

Is There Mercury in My Thermometer? If there is no liquid in your thermometer, for example, if it uses a metallic strip or coil to measure temperature (like most meat thermometers do), it is not a mercury thermometer. If the liquid in the thermometer bulb is any color other than silver, it is not a mercury thermometer.