How does a digital thermometer works without mercury?

Spirit thermometers use a non-toxic alcohol instead of mercury to register the temperature. … Digital thermometers contain a device called a thermoresistor. The thermoresistor has an electrical current running through it, and the resistance, or how freely the current can flow, changes with temperature.

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Moreover, does digital thermometer contain mercury?

The oldest thermometers used are mercury in glass. Newer thermometers include non-mercury liquids in glass and digital and electronic devices that use sensors to measure temperature. Thermometers that check body temperature in the ear, across the forehead, or have a digital display do not contain mercury.

Herein, how does a digital thermometer work physics? The tip of the thermometer (bulb) is made of a material that is very easy to transfer heat. When the bulb touches your body, heat from your body will flow through the bulb to the alcohol in the capillary pipe. … So, that’s how thermometers work.

Accordingly, how does a thermometer work briefly explain?

A thermometer has a glass tube sealed at both ends and is partly filled with a liquid like mercury or alcohol. As the temperature around the thermometer’s bulb heats up, the liquid rises in the glass tube. … When it is hot, the liquid inside the thermometer will expand and rise in the tube.

What does 37 mean in thermometer?

For most folks, a thermometer reading around 98.6 degrees Fahrenheit (37 degrees Celsius) means their body temperature is normal.

What is range of laboratory thermometer?

A laboratory thermometer, which is colloquially known as the lab thermometer, is used for measuring temperatures other than the human body temperature. It ranges from -10˚C to 110˚C. Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances.

What is SI unit of temperature?

The kelvin is the SI unit of thermodynamic temperature, and one of the seven SI base units. … Unusually in the SI, we also define another unit of temperature, called the degree Celsius (°C).

What is the use of digital thermometer?

The most commonly used thermometer in the home is the digital thermometer. Digital thermometers can be used to record temperatures from the mouth, armpit or rectum.

Which sensor is used in digital thermometer?

thermistor resistance

Why mercury is used in thermometer?

Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion. … It also has a high boiling point which makes it very suitable to measure higher temperatures. Also, it has a shiny appearance and doesn’t stick to the glass surface of glass.

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