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Because there is vacuum in the top, and the capillary is to thin for free flow of mercury.

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Thermowells are used to protct thermometers from?

Thermowells are used to protect thermometers from corrosive materials, high pressure, and turbulent flow. They provide a barrier between the process medium and the thermometer, allowing for safe and accurate temperature measurements without exposing the thermometer to harsh conditions.


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Related Questions

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 does the mercury fall or rise in a clinical thermometer when it is taken out of the mouth?

A clinical thermometer measures the max temp of the human body due to the expansion of the mercury in the bulb, which flows past a kink in the column and rises in the graduated stem, to read the highest body-temp. Once it is removed from the body, the mercury stays at that level, and does not fall because it cannot flow back into the bulb -- the kink prevents the back flow. It has to be shaken vigorously, as you know, for us to get the mercury back; then it is ready to take the temp again.. Also, the temp cannot rise further on its own from the max reading because the mercury does not expand the moment the thermometer is taken out of the body. Incidentally, temp can be measured under the armpits and in the rectum also.


Why clinical thermometer is jerked before using it again?

If you have an old thermometer that has mercury, then the shaking makes all of the mercury flow to the bottom of the thermometer. Then, you can get a better reading. The current digital ones work differently. Thermometers used for taking people temperatures are a special kind that go up with heat but don't go down with cold. So you have to shake a thermometer before taking your temperature to make the reading go down below your own temperature. Then the thermometer can go up again to read your temperature.


What are the constrictions in a thermometer?

The constriction in a thermometer is a narrow region in the capillary tube where the liquid (like mercury or alcohol) is forced to flow through. This helps to amplify the rise or fall in temperature, making it easier to read.


What does a thermometer measue besides temperature?

A thermometer typically measures temperature by detecting the thermal expansion of a substance such as mercury or alcohol. Some specialized thermometers can also measure humidity, pressure, or heat flow.


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.


How do bats sleep upside-down?

Bats have a unique adaptation in their feet that allows them to hang upside-down while they sleep. Their tendons are set up in a way that when they relax, their toes automatically clench around a perch. This specialized foot structure allows them to rest securely while hanging upside-down.


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.


Why does your nose bleed when your upside down?

If upside down, your blood flow to your head due to gravity.


Why does blood go to your head when you go upside down?

The reason why is because when the heart pumps all that blood, it has to go somewhere. So it goes through your legs and arms and stays there I guess. So when you go upside down, the blood will go down and eventually go down into your brain. That's why it isn't good for someone to stay upside down for a long period of time.


How do you restore fuel pump operation flow after roll-over rollover upside-down upside down on a 96 grand Cherokee?

im not 100% sure but many cars have a reset switch at the roll over valve, i have no idea where it is on the car i can only guess its on the fuel pump


Will the brain get too much blood if you stand upside down?

No, the brain has mechanisms in place to regulate blood flow, such as adjusting blood vessel diameter. However, standing upside down for prolonged periods can cause increased pressure in the head, leading to symptoms like dizziness and headache.