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Why the reading of thermometer is taken when the mercury stop expanding?
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∙ 10y ago
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Why is there a constriction in a clinical thermometer?
The constriction prevents the mercury from returning back to the bulb when the thermometer is removed from a particular body.
Why is the temperature of hot water taken when the mercury stop expanding?
When the mercury stops rising in a thermometer, the level reached is read off a scale etched on the glass tube. This shows the temperature of the hot water. There is little point in reading the scale until it stops moving.
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.
Why is Mercury used in thermometeres?
Mercury is a liquid over a wide range of temperature ( -39 to 357 degrees ) so it can be used in a variety of temperature ranges. Secondly it does not stick to the glass tubing of the thermometer so when the temperature falls ( i.e. after the reading is taken) all the mercury falls back into the reservoir. This ensures the accuracy of the mercury thermometer.
When heat is taken away from something what happens to the mercury in the thermometer?
It contracts.
Why lab thermometer do not have kink?
the temparature of the liquid must be read while the thermometer is in the liquid.since the level of mercury drops as soon as the thermometer is taken out of the liquid ,therefore no need of the kink in thermometer.
Why there is kink in clinical thermometer?
In a normal clinical thermometer, the mercury moves up and down the capillary tube as the temperature changes and thus if you removed it from contact with the patient the reading would steadily fall as it cooed. As you need a clinical thermometer to give you a reading of the patients temperature even after it has been removed from the patient, you need to stop the mercury shrinking back into the reservoir. The 'kink' breaks the connection between the mercury in the capillary tube and the reservoir so the reading given is accurate. On the other hand before it can be used again the mercury in the capillary tube has to be vigorously shaken back into the reservoir.On a point of interest, clinical thermometers are getting very rare because they have been phased out due to concerns regarding mercury poisoning should they break in use.
Is a thermometer a example of an independent variable?
Absolutely, the thermometer is independent of any other measuring device, therefore the actual temperature is dependent on the reading that is taken off the thermometer.
What precautions should be taken when using mercury base thermometer?
don't break it. If you do open the windows.
What is the function of constriction in clinical thermometer?
In case of ordinary thermometer if the thermometer is taken out the body whose temperature has been seen, the Mercury would fall down as the bulb gets cooled. But in case of clinical thermometer even after the thermometer has been taken out of the mouth of the patient the level of mercury would be held at the same level though the bulb falls to the room temperature. So doctor could see the temperature liesurely. To bring back the mercury to lowest level we have to give jerks to the thermometer by shaking it.
How does a mercury themometer work?
A Mercury barometer works by expanding and therefore raising the mercury of the barometer, then reading the level up to which the mercury has gone.
Why is there bend in a clinical thermometer?
It is made prismatic to refract maximum light towards its base & make mercury shining. It makes easy to take reading.
