Why mercury is used in thermometer instead of alcohol?

Why is alcohol not used in thermometer?

Alcohol is not used in a clinical thermometer. It cannot measure the high temperatures because of its low boiling point.

Is mercury or alcohol used in thermometer?

Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. Pure ethanol freezes at -115 degrees C, while mercury freezes at -38 degrees C. Thermometers rely upon thermal expansion of the liquid in a bulb at the base of a thin glass tube.

Why do thermometers use alcohol?

Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. Pure ethanol freezes at -115 degrees C, while mercury freezes at -38 degrees C. Thermometers rely upon thermal expansion of the liquid in a bulb at the base of a thin glass tube.

Is it illegal to have a mercury thermometer?

In 2001, California passed the California Mercury Reduction Act of 2001 (SB 633 – Sher). … The law also prohibited the sale or supply of mercury fever thermometers after July 2002. Mercury thermostats were banned from sale in California in January 2006.

Which expands more alcohol or mercury?

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.

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Can u touch mercury?

Mercury is a very toxic or poisonous substance that people can be exposed to in several ways. If it is swallowed, like from a broken thermometer, it mostly passes through your body and very little is absorbed. If you touch it, a small amount may pass through your skin, but not usually enough to harm you.

How accurate are alcohol thermometers?

Alcohol thermometers are also inexpensive and durable. They are typically not as accurate as mercury thermometers because of the alcohol’s susceptibility to evaporation, polymerization potential and capillary separation. Their primary advantage is safety to humans and the environment.

What is the alcohol used in thermometer?

The two common liquids used in liquid in glass thermometers are alcohol (ethanol) and mercury.