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2009-06-17 21:47:57
2009-06-17 21:47:57

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


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Like all other metals mercury also expand with rise in temperature.The design of thermometer makes it visible. As you can see there is mercury bulb at one end(witch we put in mouth or arm pit. )witch taper down into capillary tube in the length of thermometer so slight expansion in mercury in the bulb appears to amplify manifold and triangular design and color of mercury makes it visible against colored on one side of thermometer. Also glass on the mercury bulb is thin so that external heat should pass to mercury in short time.

is it dangeorous to hold a thermometer from its bulb

the mercury inside the thermometer expands due to the heat

The exterior of the bulb of the thermometer expands first, resulting in the mercury level to go down. After that the mercury in the bulb expands more than the glass bulb, resulting in the subsequent rise of the mercury level.

It prevents the mercury from flowing back into the bulb.

the red liquid in the themometers is mercury.

In a mercury thermometer, the level of mercury falls as the temperature of the air around it cools.A mercury thermometer has a bulb of mercury at the bottom and a thin tube above it with markings in Celsius degrees or Fahrenheit degrees. When the temperature warms, the mercury expands and rises up the tube. When the temperature cools, the mercury contracts and shrinks back toward the bulb at the bottom.

There is a constriction in the tube, forming a bottle-neck.. Shaking the thermometer will get the mercury back to the bulb at the bottom.

Wet bulb thermometer is a regular thermometer but the base that is the part where the mercury get stored is kept in some wet condition depend on the humidity level you want to check and then we are checking the environmental temperature. It mainly used for scientific purposes and not for regular use. Dry bulb is our regular thermometer where the mercury storage point is kept dry.

It is a very good idea for the thermometer manufacturer, but it is a very bad idea for you because the thermometer bulb may blow out and release the dangerous mercury stored inside.

to completely bathe the mercury bulb of the thermometer so you can get an accurate measurement

The construction in the capillary tube does not allow the mercury to flow back into the bulb when the thermometer is taken out from the patient's mouth.

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.

There is a kink put in the tube which carries the mercury up the thermometer, that is why it needs to be shaken to send it back to the bulb

At the age of 31, Galileo and his associates invented the thermometer because no instrument existed to measure temperature. Galileo's thermometer consisted of water in a glass bulb. The level of the water in the bulb changed according to the external temperature.

Because it expands with temperature and can no longer fit in the little bulb at the bottom of the thermometer.

both are used to check the temperature and has a bulb and mercury.

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.

The constriction in the capillary tube does not allow the mercury to flow back into the bulb when the thermometer is taken out of the patient's mouth.

Thermometer. They contain Mercury which is a metal.

If the clinical thermometer is a mercury based thermometer, it needs to be shaken down prior to each use. This is because there is a pinch point between the mercury reservoir bulb and the capillary tube, to ensure that the mercury does not shrink back into the bulb after the temperature has been taken. The mercury has therefore to be shaken back into the bulb before another measurement can be made. One should note that in many countries use of mercury based clinical thermometers is now discouraged (because mercury is toxic) and electronic thermometers are used in stead - these do not need shaking.

If the last word was meant to be "alcohol", then the answer is a thermometer.

the mercury should be at normal body temperature level before using it the thermometer should be cleaned after use with normal water the bulb of the thermometer should not be touched

The bulb of a thermometer is used as a hot spot or "fire place" because as the temperature rises the bulb is heated which as heats the mercury inside to estimate the outside temperature. So as you see the bulb attract to sunlight to heat itself like a hot spot.

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

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