How does a thermometer work chemistry

What are clinical and laboratory thermometer for Class 7?

(i) The temperature range of clinical thermometers is from 35°C to 42°C while that of laboratory thermometer is from −10°C to 110°C . (ii) Clinical thermometer is used to measure the temperature of a human body.

Clinical thermometer is used to measure our body temperature . The range of this thermometer is from 35°C to 42°C. For other purposes, we use the laboratory thermometers. The range of these thermometers is usually from –10°C to 110°C.

: a thermometer for measuring body temperature that has a constriction in the tube above the bulb preventing movement of the column of liquid downward once it has reached its maximum temperature so that it continues to indicate the maximum temperature until the liquid is shaken back down into the bulb.

The thermometer used by us or doctors to measure the body temperature when we have fever is a clinical thermometer.

Is the red stuff in thermometers mercury?

Mercury is a silver-white to gray substance. If your thermometer is filled with a red liquid, your thermometer contains red dyed alcohol or mineral spirits and not mercury .

In a mercury thermometer , a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.

Many older thermometers contained mercury. Because mercury has very toxic properties that can lead to sickness or death if the thermometer breaks, more modern thermometers use a form of colored alcohol .

Those days have passed. Since 2001 , 20 states have banned mercury “fever thermometers” for medical use, and regulations tighten every year.Mar 1, 2011

Are mercury thermometers still in use?

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 ...Feb 10, 2011

In general, you can clean up a small mercury spill yourself, such as from a fever thermometer or thermostat .

If a test shows you have mercury poisoning (too much mercury in your body), your doctor can give you drugs that will remove the mercury from your body . Call the Poison Control Center toll-free, 1-800-222-1222, if you or your doctor need help understanding your test results.

The chemical element mercury (Hg) is sometimes called quicksilver because of its liquid metallic appearance. While the sight of metal pouring from the hand is intriguing, mercury is extremely toxic when inhaled or touched and should never be handled with bare skin .

When did they stop putting mercury in thermometers?

Those days have passed. Since 2001 , 20 states have banned mercury “fever thermometers” for medical use, and regulations tighten every year.

Basal Thermometer or clinical thermometer contains mercury about 2.25 grams.

Alcohol thermometer and mercury thermometer are two types of thermometers which are composed of a bulb and a marked glass tube. The main difference between alcohol and mercury thermometer is that the bulb of mercury thermometer is filled with mercury whereas the bulb of alcohol thermometer is filled with an alcohol .Dec 24, 2017

A broken mercury-containing thermometer can be toxic if the vapors are inhaled . The risk of poisoning from touching or swallowing mercury from a broken thermometer is low if appropriate clean-up measures are taken.

Is the liquid inside a thermometer poisonous?

The small silvery ball in a mercury thermometer can be dangerous if the glass breaks and the mercury is not cleaned up properly . The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. Each thermometer contains about . 5-1.5 grams of mercury.

When the tip of the mercury thermometer touches the material it is measuring, the material conducts heat energy to the mercury. Then the mercury expands as it turns into a liquid and begins to rise up the tube. The place where the mercury stops on the scale is where you can take the reading of the temperature.

But increasingly, selecting an alternative to Hg is chiefly a matter of choosing among one of the three sensor types used in digital thermometry: platinum resistance (PRT), thermistor, and thermocouple .

There are liquid-in-glass thermometers that contain a non-mercury silver substance Galinstan® . Galinstan liquid consists of tin, indium, and gallium. According to its manufacturer, Galinstan is not toxic when swallowed because it passes through the digestive system without effect.

How does a thermometer find the temperature of an object?

A thermometer measures temperature through a glass tube sealed with mercury that expands or contracts as the temperature rises or falls . The tiny size of the bulb and micro-fine size of the tube help the mercury reach the temperature of what it is measuring very rapidly.

A thermometer is a device used to measure temperature .

Thermometers are used to measure temperature according to well-defined scales of measurement , which use pre-defined reference points to help compare quantities. The three most common temperature scales are the Fahrenheit, Celsius, and Kelvin scales.

A thermometer is a glass tube filled with a liquid (mercury) which expands or contracts depending on the temperature of the object it is in contact with. It measures the average kinetic energy (one type of thermal energy) of the molecules of a substance in degrees Fahrenheit (F) or Celsius (C).