answersLogoWhite

0


Best Answer

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.

User Avatar

Wiki User

14y ago
This answer is:
User Avatar
More answers
User Avatar

Wiki User

13y ago

A Clinical Thermometer has a very small constriction at the bottom of the column of mercury. As soon as the thermometer is removed from the patient, the mercury column starts to shrink, but the rate of shrinkage is such at the constriction, the mercury column breaks at that point, and the length remaining is taken as the temperature.

Similarly when used on the patient, the mercury takes time to be forced through the constriction, and we must also allow time for the glass column (or the capillary at least) to stabilize to its new temperature.

This answer is:
User Avatar

User Avatar

Wiki User

8y ago

That only applied to the old mercury filled thermometers (which should no longer be used because the mercury is so poisonous). The mercury had to be shaken down , back into the bulb reservoir after each use. Modern digital thermometers do not need this procedure, indeed doing it may damage them.

This answer is:
User Avatar

User Avatar

Wiki User

14y ago

They shake it to get the temperature down so it can give a accurate reading.

This answer is:
User Avatar

User Avatar

Oo Ii

Lvl 2
1y ago

aclinical thermometer is jerked before usinng it because

This answer is:
User Avatar

User Avatar

Wiki User

16y ago

to force the mercury down the tube

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why clinical thermometer is jerked before using it again?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Continue Learning about Physics

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 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.


What Happens when you heat up a thermometer with your hands?

If you hold a thermometer close to you it will start to heat up. Your body temperature will start affecting it and the heat reading on it should start to rise. Once you pull it away from you (depending on the temperate of where you are) it should start to cool off again.


In a clock a large gear completes a rotation every 45 seconds and a smaller gear completes a rotation every 18 seconds How many seconds pass before the gear align again?

45= 9x5 18= 9x2 9x5x2=90 seconds pass before the gear align again


What is rest period?

A rest period is a time in which a person can stop what they were doing to recover mentally or physically before starting again - a "break".

Related questions

How does the kink in a mercury or alcohol work in a clinical thermometer?

The kink stops the mercury from falling, giving the user/reader of the thermometer time to read the highest temperature recorded. Shaking the thermometer lets the mercury fall again.


What happens when you put a clinical thermometer into boiling water?

if its really really hot it will fry but if its just hot then it will just go up really high


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 doctors dips the thermometer in a liquid before use?

There are two reasons why the doctor dips in alcohol before use. The first is that any infections of the previous patient may have does not infect others. The second is that the mercury level should fall down to below 35 degrees centigrade before use.


How do you become a pshycologist after general nursing and midwifery course?

In much of the world, becoming a clinical psychologist involves completing a PhD in clinical psychology. You likely need to begin again with a new bachelors degree in psychology before continuing to graduate school.


What is the purpose of the 'kink' in clinical thermometer?

In a normal Mercury thermometer, the mercury moves up and down the capillary as the temperature changes and thus if you removed it form contact with the patient the reading would steadily fall as it cooed. As you need a medical thermometer to give you a reading of the patients temperature even after it has been removed form the patient, you need to stop the mercury shrinking back into the reservoir. The 'kink' does this, it breaks the connection between the mercury in the capillary and the reservoir so the reading given is accurate. On the other hand before it can be used again the mercury in the capillary has to be vigorously shaken back into the reservoir. On a point of interest, clinical mercury thermometers (with the 'kink') are getting very rare because they have been phased out due to concerns regarding mercury poisoning should hey break in use.


What is range of clinical thermometer in Fahrenheit?

Because clinical thermometer is used in hospitals etc for checking temperature of a person and human temperature is not below than 95 degree F and not more than 110 degree F i.e 35 degree C and 42 degree C


Why do you flick thermometers before using them?

This is only in the case of of clinical thermometers, which usually have mercury inside them. These thermometers have a constriction just after the bulbthat allows the mercury to flow due to the pressure of expansion and contraction but is thin enough not to allow the mercury back into the bulb, to allow people to read the thermometer without having to hurry. people flick the thermometers to force the mercury back into the bulb so that temperature can be taken again.


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.


What are the types of meter?

There are many, many different kinds of meter. The type is determined by the prefix; Thermometer = measures temperature, from the Greek 'thermo' Speedometer = measures speed and so on, again and again.


How do you Change Celsius to Fahrenheit on a ear thermometer from Meijer?

For a Meijer K1-8120 from Bestmed. Turn on the thermometer... when display pops up, press the button again. The units should now be in Fahrenheit . Hope this helps.


How do you have more semen?

You need to stop jerking off or masturbating for one day or more and after those few days, if you jerk off again you'll cum way more than you did last time you jerked off =)