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Because the pressure of air may be greater than the pressure of the ascending Mercury.

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Q: Why the mercury can not rise in a lab thermometer if there is air in the glass tube?
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Related questions

What is the definition of Glass thermometer?

thermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheit; mercury expands with a rise in temperature causing a thin thread of mercury to rise in the tube


Why the mercury can not rise in a lab thermometer if there is air in glass tube?

Because the pressure of air may be greater than the pressure of the ascending Mercury.


Who element used of the glass tube of clinical thermometer to measure thermometer?

mercury


What is inside the glass tube from a thermometer?

either mercury or alcohol


What is the signal conditioner of mercury-in-glass thermometer?

The capillary tube of the thermometer ( in case of a mecury thermometer).


Is the external bulb of a thermometer also made of mercury?

The red liquid in a thermometer is Mercury, which is usually encased in a glass tube


What does a clinical thermometer consist of?

a clinical thermometer consists of mercury(Hg) concealed inside a glass tube with a bulb at the bottom. the bulb portion has the mercury and is thermo-sensitive. owing to the rise in temperature, when kept under the tongue of a patient, the mercury rises over the calibrated tube portion.


How the liquid in a thermometer changes so that it can be sued to measure temperatures?

The thermometer is a sealed glass tube containing mercury in a vacuum. The mercury column will rise or fall due to expansion, and the level is read off a temperature scale.


Which element is used in the glass tube of a clinical thermometer to measure temperature?

mercury


Which element is used in the glass tube of clinical thermometer to measure tepperature?

MERCURY


Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth?

Mercury does not fall or rise in a clinical thermometer when taken out from the mouth because of the KINK present in it.


What is in a thermometer besides Mercury?

There is nothing else in a mercury thermometer. However, some similar (glass tube-type) thermometers contain alcohol instead of mercury. Ray