Mercury Thermometer In a mercury-in-glass thermometer, a glass tube is crammed with mercury, and a customary scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and therefore the temperature is often scanning from the size.
Mercury thermometer is often wont to confirm body, liquid, and vapor temperature. Mercury thermometer is utilized in households, laboratory experiments, and industrial applications.
Household Uses of Mercury Thermometer
Mercury thermometer common menage uses of mercury thermometers embody fever thermometers and kitchen appliances, candy, and meat thermometers. Though this unit didn’t make it to our best blood pressure monitor it still has some quality. Let’s have a look!
Mercury fever thermometers are the product of glass the dimensions of straw, with a silvery-white liquid inside. They are common in many households, schools, and medical facilities.
There live 2 general varieties of thermometers that measure body temperature:
Oral/Rectal/baby thermometers, containing about 0.61 grams of mercury. Basal temperature thermometers (used to track slight changes in body temperature), containing about 2.25 grams of mercury.
Is There Mercury in My Thermometer?
If the liquid in the thermometer bulb is any color other than silver, it is not a thermometer.
Educational and Medical Uses of Mercury Thermometer
Mercury thermometers are also utilized in several applications, including chemical experiments, water and acid baths, blood banks, ovens, and incubators.
Mercury thermometers are used in:
• Power plants and piping
• Chemical tanks and vats
Phasing out Mercury Thermometer in Industrial and Laboratory Settings
EPA has launched an attempt to cut back the utilization of mercury-filled non-fever thermometers utilized in industrial settings wherever appropriate alternatives exist.
As part of a partnership EPA developed with the National Institute of Standards and Technology (NIST), NIST no longer provides calibration services for mercury thermometers.
You can read more about the impact the decision will have in NIST’s February 2011 press release announcing the change. In January 2012, EPA issued a final rule incorporating updated ASTM International (ASTM) standards into EPA regulations (PDF)(11 pp, 204 K, About PDF).
EXIT These changes provide flexibility to use alternatives to mercury-containing thermometers. The rule applies to certain regulations pertaining to do date, multiple ASTM standards are updated to approve the utilization of mercury-free alternatives for temperature measuring. View a list of the updated ASTM standards.
For additional info regarding phasing out industrial mercury thermometers, visit EPA’s Phasing Out of Mercury Thermometers Used in Industrial and Laboratory Settings page.
Restrictions on Sales of Mercury Fever Thermometer
Some states and municipalities have passed laws or ordinances barring the manufacture, sale, and/or distribution of mercury fever thermometers. This is to assist take away the threat of measuring device breakage and therefore the sequent unharnessed of mercury vapor inside.
At least 13 states California, Connecticut, Illinois, Indiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, Rhode Island, Oregon, and Washington have passed such laws. The Health Care Without Harm website presents information on specific state laws, resolutions, and declarations.
Alternatives to Mercury Fever Thermometer
A variety of correct and reliable mercury-free fever thermometers are on the market at your native pharmacy. The most similar alternatives to mercury fever thermometers are battery- and solar-powered digital thermometers. These are just like mercury thermometers in each worth and use.
These can all be used orally, rectally, or in the armpit. You should choose a thermometer that is easy to use and read. If you are choosing a battery-powered digital thermometer, choose one that contains a replaceable battery. Some of these thermometers do not have replaceable batteries.
Cleanup and Disposal
If you break a thermometer while using it or if you improperly dispose of it, the thermometer will release mercury vapors that are harmful to human and ecological health.
• What to do when a mercury fever thermometer breaks/spills
• How to recycle and dispose of mercury products
The Mercury-in-Glass or the Mercury Thermometer
Mercury thermometer is extremely repeatable and accurate over many years. You could put a working mercury thermometer in a time capsule and bury it for 10,000 years and it would still be working accurately.
As long as the glass has not been cracked it will continue to function accurately.
The mercury-in-glass or the mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam (1714). It consists of a bulb containing mercury attached to a glass tube of narrow diameter; the volume of mercury in the tube is much less than the volume in the bulb.
The volume of mercury changes slightly with temperature; the small change in volume drives the narrow mercury column a relatively long way up the tube. The space above the mercury may be filled with nitrogen gas or it may be at less than atmospheric pressure, a partial vacuum.
In order to calibrate the thermometer, the bulb is made to reach thermal equilibrium with a temperature standard such as an ice/water mixture, and then with another standard such as water/vapor, and the tube is divided into regular intervals between the fixed points.
Frequently Asked Questions (FAQs) About Mercury Thermometer
Q. Do they still make mercury thermometer?
A. Those days have passed. Since 2001, 20 states have banned mercury “fever thermometers” for medical use, and regulations tighten per annum. But as of today the federal has more or less killed the mercury-in-glass thermometer within the United States—NIST has announced it’ll not calibrate mercury thermometers.
Q. Are mercury thermometers accurate?
A. 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%.
Q. Is it safe to use a mercury thermometer?
Answer: The small silvery ball during a mercury-in-glass thermometer is often dangerous if the glass breaks and therefore the mercury isn’t cleaned up properly. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife.
Q. How does a mercury thermometer work?
Answer: In a mercury-in-glass thermometer, a glass tube is crammed with mercury and a typical scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and therefore the temperature is often read from the size. Mercury thermometers are often wont to determine body, liquid, and vapor temperature.
Q. Which is better mercury thermometer or digital?
Answer: Digital thermometers provide faster results. Digital thermometers provide fast results as against mercury thermometers whose readings are slower to understand because you’ve got to attend for the mercury to heat then slowly rise to display the temperature.
Q. Why are mercury thermometers no longer used?
Answer: The reason: Mercury released into the environment from a broken thermometer is very 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.
Q. What happens if you break a mercury thermometer?
Answer: A broken mercury-containing thermometer is often 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.
Q. Can mercury in thermometer kill you?
Answer: “When a mercury-in-glass thermometer breaks, the mercury spilled starts vaporizing immediately in temperatures of 22-24 degrees Celsius. The vapors can be inhaled by anyone in the vicinity. It goes straight into the lungs and into the blood and the brain. It is very dangerous.”
Q. How long do you leave a mercury thermometer in your mouth?
Answer: After shaking the mercury down, place the thermometer under the child’s tongue, with the bulb toward the back of the mouth. Tell your child to keep the lips firmly closed, but not to bite the thermometer. 3. Leave the thermometer in place for 3 minutes.
Q. Why is mercury a good choice for a thermometer?
Answer: Mercury is that just one in a liquid state at temperature. It’s utilized in thermometers because it’s a high coefficient of expansion. Hence, the slightest change in temperature is notable when it’s utilized in a thermometer. It also features a high boiling point which makes it very suitable to live at higher temperatures.
Q. What replaced mercury in thermometers?
Answer: Spirit thermometers use non-toxic alcohol rather than mercury to register the temperature. Like liquid mercury, the alcohol expands in volume because it gets warmer. Causing the liquid to maneuver up the skinny tube inside the glass thermometer. Digital thermometers contain a device called a Thermo resistor.
Q. What gets rid of mercury?
Answer: Mercury is also eliminated in the urine, so drinking extra water can help to speed up the process. Avoiding exposure. The best way to get rid of mercury in your body is to avoid sources of it whenever you can.
As you reduce your exposure, the extent of mercury in your body will decrease also.
Q. How dangerous is a broken mercury thermometer?
Answer: Mercury vapor isn’t irritating and has no odor, so people don’t know once they are breathing it. Even the tiny amount of mercury from a broken thermometer can cause harm, especially to children, unless it’s properly cleaned up and removed.
Q. Does mercury vapor go away?
Answer: At air temperatures found in homes, mercury evaporates slowly. Outdoors, mercury vapors tend to travel away quickly, but indoors (particularly with windows closed), mercury vapors will accumulate within the air.
Q. Is mercury really poisonous?
Answer: Mercury in any form is poisonous, with mercury toxicity most ordinarily affecting the neurologic, gastrointestinal (GI), and renal organ systems. Poisoning may result from mercury vapor inhalation, mercury ingestion, mercury injection, and absorption of mercury through the skin. (See Etiology and Prognosis.)
Q. Why is a mercury spill dangerous?
Answer: This liquid sort of mercury is particularly dangerous because it vaporizes at temperature. If mercury vapor is inhaled, it is easily absorbed by the body. Where it first gets into the lungs and from there into the blood and the brain. Nerve poison can cause sleep disorders, agitation, and paralysis.
Q. What are the dangers of using mercury?
Answer: Health effects of mercury exposure. The inhalation of mercury vapor can produce harmful effects on the nervous, digestive and immune systems, lungs, and kidneys, and should be fatal. The inorganic salts of mercury are corrosive to the skin, eyes, and alimentary canal, and should induce kidney toxicity if ingested.
Q. What are the properties of mercury?
Answer: Physical Properties. Mercury may be a silvery-white, shiny metal, which is liquid at temperature. Due to its high physical phenomenon, mercury has the power to wet metals. When the solubility limit of metal in mercury is exceeded, mercury still can wet the metal forming a thick silvery amalgam paste.
Q. Are mercury-free oral thermometers accurate?
Answer: Very accurate thermometer, but its size makes it a bit more difficult to hold in the mouth. Shaking it back down after use requires effort. Our nurses like glass thermometers.
Q. Where can I get rid of mercury?
Answer: Find a Recycling Site Near You. Many Clean Sweep sites and community household hazardous waste collection centers accept mercury-containing items from the public at no charge. When transporting your items to a recycling site, make sure you treat items with care so they do not break in your house or car.
Q. How do you detox from mercury fillings?
Answer: Take two teaspoons mixed in water, coconut milk, or juice, or pip out in tablet form. Chlorella is additionally great for heavy metal detoxing, though spirulina seeks out mercury specifically. Barley Grass Juice Extract Powder prepares the mercury for complete absorption by the spirulina, so take these together.
A Final Note
In principle, thermometers made of a different material (e.g., colored alcohol thermometers) might be expected to give different intermediate readings due to different expansion properties.
In practice, the substances used are chosen to have reasonably linear expansion characteristics as a function of true thermodynamic temperature, and so give similar results.
The application of mercury (1714) and the Fahrenheit scale (1724) for liquid-in-glass thermometers ushered in a new era of accuracy and precision in thermometry and are still to this day (as of 1966) regarded as one of the most accurate thermometers available.