Why do you shake a thermometer before use?

Why do you shake a thermometer before use? It takes big forces to push the mercury quickly through such a capillary. During expansion, there is easily enough force to push the mercury up through the capillary. Shaking the thermometer hard is what gets the mercury down and ultimately drives it through the constriction so that it rejoins into a single column.

Why should we shake the thermometer before use? The shaking is to reduce the level of the medium in the thermometer to a temperature well below normal so that an an accurate temperature can be read after using.

Why do we jerk the thermometer? The jerk to the thermometer will allow the mercury in or above the kink to flow into the bulb so that the mercury level is below normal temperature.

Do you shake thermometer? Shaking the thermometer hard is what gets the mercury down and ultimately drives it through the constriction so that it rejoins into a single column. In effect, you are making the glass accelerate so fast that it leaves the mercury behind. The mercury drifts to the bottom of the thermometer because of its own inertia.

Why do you shake a thermometer before use? – Related Questions

Should you ever shake a thermometer?

(1) If the thermometer reading is below 94ºF (34.4º C), you have shaken down the thermometer sufficiently. (2) If the thermometer reads 94º F (34.4º C) or above, continue to shake down the thermometer until a desired reading is shown.

Why should we not hold the thermometer by its bulb?

Solution: It advised not to hold the thermometer by its bulb while reading it because the actual reading of human body temperature will get affected. This is for the reason that level of Mercury raises due to human body temperature. The standard way to hold the thermometer is from its top end.

Which is the best answer that thermometer requires to be shaken down?

The mercury should be shaken down below 96°F (35.5°C) before the patient’s temperature is taken.

Why is water not used in thermometer?

Water is not able to be used as a thermometer liquid because of its higher freezing point and lower boiling point than the other liquids in general. If water is used in a thermometer, it will start phase variation at 0∘C and 100∘C.

How do you shake down a geratherm thermometer?

If you put the thermometer with the metal tip down into a sock and twirl it around, it will go down very quickly and easily.

Should you shake down a lab thermometer?

Do not “shake down” thermometers or use it as a stirring rod. Thermometers break easily. You must ask for help in cleaning up broken thermometers in order to prevent mercury contamination in the lab.

Can I still use a mercury thermometer?

Although mercury thermometers have been mostly phased out of daily home use, the tool, which was invented in the 1700s by Gabriel Daniel Fahrenheit, remains a standard measuring device for many industries, including regulating the temperature of a chemical concoction being made in an industrial lab, and monitoring the

How do you know if a thermometer is not working?

For dial thermometers:

Let it sit for a few minutes, then read the dial. It should register about 32 degrees. If it doesn’t, use a wrench (or the stem case — many have adjusters built in) to hold the hex screw behind the dial firmly, then twist the dial until it registers the proper temperature.

What is the normal temperature of a healthy person?

The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the “normal” body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C).

Why does the mercury not fall or rise in a clinical thermometer?

The mercury does not fall or rise in a clinical thermometer when taken out of the mouth because of the presence of kink. It prevents mercury level from falling on its own.

Why do we give a few sharp jerks to the clinical thermometer before using it?

You may have noticed that a few sharp jerks are given to clinical thermometer before using it. Why is it done so? Jerk will allow the mercury flow into the bulb above kink which will make mercury level below normal temperature.

Who uses thermometer?

Thermometers measure temperatures in degrees, according to either the Celsius or Fahrenheit system. Meteorologists use thermometers to find out how hot it is or if it’s below freezing. Doctors use thermometers to check your body temperature — a very high or low body temperature means you’re sick.

How long do I keep a thermometer in my mouth?

Place the thermometer tip under the tongue. Hold the thermometer in the same spot for about 40 seconds. Readings will continue to increase and the F (or C) symbol will flash during measurement. Usually, the thermometer will make a beeping noise when the final reading is done (usually about 30 seconds).

What should be avoided when using glass thermometer?

How do I use a glass thermometer? There should not be anything hot or cold in your mouth for 10 minutes before taking a temperature.

Will it be alright if water or oil is used in thermometer?

It won’t be alright if we use oil or water in a thermometer as these liquids will stick to the capillary tube of the thermometer and won’t give right measure. Mercury has got the high coefficient of expansion than most metals and also with oil and water.

What is poor thermometric liquid?

Merhcey: water cannot b used as a thermometric liquid only bcos it wets glass and nt bcos it is a poor conductor.the liquids used in the thermometer do not wet glass take mercury for example.

Can we use other liquids in thermometer?

Mercury is one of the most familiar materials used in liquid thermometers. Other liquids, such as kerosene or ethanol, may also be used in these types of thermometers. Mercury, for instance, becomes a solid at -38.83 degrees Celsius (-37.89 degrees Fahrenheit).

How do I get my mercury thermometer down?

Firmly grasp the thermometer near the top, so that the bulb containing the mercury (or other indicating fluid) is pointed downward. Rapidly move the thermometer down and sharply reverse direction (and snap the wrist upward). When the thermometer reaches the lowest point of the stroke several times.

Is 99 a fever?

An adult probably has a fever when the temperature is above 99°F to 99.5°F (37.2°C to 37.5°C), depending on the time of day.

How do you shake down a non mercury thermometer?

This thermometer is far more accurate than digitals, and it does not easily break. Don’t use the sock trick, you just need to hold this at the end of the tube and flick your wrist with a downward motion for about ten seconds. It will shake down just fine.

Does a mercury thermometer ever stop working?

A separation of the mercury in your thermometer is not a defect! It is a condition, normally caused by shock in transit, which of course must be rectified before using the thermometer, or you will experience significant errors in your readings.