Question: How Long Should You Use A Mercury Thermometer?

Do you have to shake mercury thermometer?

There is a small bend in the mercury channel of a clinical thermometer that uses mercury.

You must shake the thermometer to get the mercury from a previous reading from the thermometer back into the bulb (or at least to a low temperature number) so that a new reading can be taken..

Can I still buy a mercury thermometer?

While mercury thermometers can measure temperature within one degree Celsius, digital thermometers can be as accurate as 0.001 degrees C a difference of four orders of magnitude in accuracy. This changeover won’t be a big deal for the average person “In fact, you can’t buy [mercury thermometers] anymore,” Strouse said.

What thermometer do doctors recommend?

1. iHealth No-Touch Forehead Thermometer. Amazon’s No. 1 bestselling health care thermometer uses infrared technology to read one’s temperature from about 3 centimeters (or about 1.2 inches) away.

How accurate are forehead thermometers?

Generally, the correlation of temperature results are as follows: The average normal oral temperature is 98.6°F (37°C). A rectal temperature is 0.5°F (0.3°C) to 1°F (0.6°C) higher than an oral temperature. … A forehead (temporal) scanner is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature.

Is breaking a mercury thermometer dangerous?

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.

How accurate is a mercury thermometer?

In clinical studies between 9 and 23% of repeated measurements using an electronic thermometer differ by 0.5 degrees C or more whilst the corresponding range for mercury thermometers is 0.6%.

Which thermometer is better mercury or digital?

Digital thermometers provide fast results as opposed to mercury thermometers whose readings are slower to realize because you have to wait for the mercury to heat and then slowly rise to display the temperature. … Mercury thermometers are designed utilizing the idea that mercury expands with heat.

Why are mercury thermometers no longer used?

The reason: Mercury released into the environment from a broken thermometer is highly poisonous. Pure mercury and its compounds can cause neurological problems and other ailments in people exposed to them. … Federal and state authorities have lobbied since 2002 for bans on medical mercury thermometers.

Why do you shake a mercury thermometer?

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 is mercury a good choice for thermometer?

Mercury is the only one in liquid state at room temperature. It’s used in thermometers because it has high coefficient of expansion. … It also has a high boiling point which makes it very suitable to measure higher temperatures. Also, it has a shiny appearance and doesn’t stick to the glass surface of glass.

How long should I put thermometer?

Hold the thermometer in place. You will hear a beep in about 30 seconds. For glass thermometers, hold in place for 3 minutes. Take the thermometer out and read the temperature.

Is it safe to use a mercury thermometer?

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 .

How do I know if my mercury thermometer is working?

Is There Mercury in My Thermometer?If there is no liquid in your thermometer, for example, if it uses a metallic strip or coil to measure temperature (like most meat thermometers do), it is not a mercury thermometer.If the liquid in the thermometer bulb is any color other than silver, it is not a mercury thermometer.More items…•

What is the most accurate thermometer for home use?

Best Overall Thermometer: Kinsa Digital Smart Ear Thermometer. This smart digital thermometer takes the spot as our best overall option. The ultra-fast reader takes an accurate reading in the ear in only one second, which is perfect for parents trying to take temperatures for a finicky, squirmy kid.

What type of thermometer is the most accurate?

Rectal thermometers, which go into your rear end, are the most accurate, but they can be uncomfortable. Armpit, ear, and forehead thermometers aren’t as accurate. Most doctors think an oral thermometer, which you hold under your tongue, is best.

What happens if you break a mercury thermometer?

Mercury vapor is not irritating and has no odor, so people do not know when they are breathing it. Even the small amount of mercury from a broken thermometer can cause harm, especially to children, unless it is properly cleaned up and removed.

Are mercury free thermometers accurate?

Most range from 0.5° to 1° C. Accuracy limits for non-mercury thermometers below 150° C are also compatible with mercury thermometers; accuracy is typically ± 1° – 2° C. … Above 100° C mercury thermometers have an accuracy range of ± 1.5° C, while non-mercury have an accuracy limit of ± 3° C.