Mercury Thermometers: Mercury thermometers are highly durable because Mercury does not evaporate easily. When these thermometers are placed in warm solutions, they can measure the temperature of that solution using the expansion of the liquid inside the bulb through the capillary tube. There are also industrial … theremometers that are used in furnaces. Alcohol has a thermometric fluid -Alcohol expands uniformly. Killing germs is very important when using your thermometer and disinfecting after using it rectally is also important.
Introduction A thermometer is a device used to measure the temperature. What are the advantages of a Mercury Thermometer? Meanwhile, we bought an ear thermometer as my son was uncomfortable with the mercury thermometer; moreover we used to check fever every 4-5 hours. Mercury is extremely toxic, alcohol is psychoactive if ingested in large quantities, alcohol is flammable, etc. Infrared thermometers uses Infrared thermometers are used in some typical circumstances where the object to be measured is moving , where the object is surrounded by the electromagnetic field , as in the induction heating , where the object is contained in the vacuum or the other controlled atmosphere. Well, the obvious disadvantage is the toxicity.
Advantages You can stand out. Its important to know what kind of alcohol is in your thermometer because the chemical properties of each one are different. Radiometers are used for remote observations. Some believe that non-mercury thermometers should not be used in secondary schools because of this inaccuracy. Most places in the world, this isn't important, but at both poles temperatures can drop below this temperature, so for accurate temperature recording, a mercury thermometer is inappropriate. Personal experience Let me narrate how I explored the ambiguity factor related with usage of thermometers.
Advantages: Ssource of energy in the diet. 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. I nfrared thermometers are used to check arriving travellers for fever , Most common infrared thermometers are the spot infrared thermometer or infrared pyrometer that measures the temperature at a spot on a surface. Can improve mood, increase relaxation and aid sleep. Well, an overdose of herbal remedies can be dangerous too. When it comes to thermometers, like most things, you get what you pay for.
An iron- constantan thermocouple can measure temperature from —200°C to about 850°C, and is used typically in paper and pulp mills, re-heat and annealing furnaces and in chemical reactors. At 5 C the reading will sky rocket in a split second from being touched bare handed. Extension leads are then used, usually made of the same material as the thermocouple but of smaller gauge. I'm finding the comments more entertaining than the subject! The picture shows an example of a liquid crystal sheet in response to warming. . When measuring the temperature of a heat process a resistance value of 177 W is measured using a Wheatstone bridge. This change in molecular structure affects the wavelengths of light that are absorbed and reflected by the liquid crystals, resulting in an apparent change in the color of each temperature event.
Disadvantages are mild and may i … nclude some very minor health problems. Anyway, I am giving you the link to the Wikipedia page related to mercury poisoning If a mercury thermometer breaks, cleaning it is a nightmare. Nowadays most thermometers are electric, for greater accuracy and safety. This causes the temperature event to appear green. Infrared thermometers Advantages of Infrared thermometers The measurements can be taken from a distance for hot surfaces and the objects or for the food service purposes where the items should not be touched or contaminated and they are excellent for the surface measurements. To our goodness the lady pharmacist was friendly, she allowed us to test the thermometers.
And like all metals it expand when heated. Lets just say you have Ethanol in your thermometer, the melting and boiling points of which are about -114ÂºC and 78ÂºC respectively. This capillary tube is made of the same glass used to make the bulb, and it is inside a glass tube which has the temperature scale marked on. While inhaling vapors of the metal is most dangerous with constant exposure, getting any mercury on your skin can be very harmful. Applications Platinum resistance thermometers may be used as calibrating devices or in applications such as heat- treating and annealing processes and can be adapted easily for use with automatic recording or control systems.
The temperature is taken by inserting either into the mouth under the tongue, under the armpit axillary temperature , or into the rectum through the anus rectal temperature. Additional leads are frequently necessary for extension leads or voltmeter terminal connections. The construction of a typical copper- constantan thermocouple for industrial use is shown in Figure 25. Mercury Thermometers:Liquid inside the bulb of mercury thermometer is Mercury. You can attract more customers if they are draw to your unique business. The thread of the thermometer is quite fragile, and when it breaks it is nearly impossible to rejoin. Few months ago, my son was sick; he had stomach infection and fever.
However it has a low boiling point at about 79°C. Advantages The liquid-in-glass thermometer is simple in construc- tion, relatively inexpensive, easy to use and portable, and is the most widely used method of temperature measurement having industrial, chemical, clinical and meteorological applications. Measurement Alcohol Thermometers: Alcohol thermometer is suitable for measurement of low temperatures. Galvanometer G is a sensitive centre-zero microammeter. The most commonly used colors as dye are blue or red. Alcohol thermometers may be used to measure temperatures from -115Â°C freezing point of alcohol to 785Â°C boiling point of alcohol.