set up when the junction of two dissimilar metals is heated. It has low specific hest capacity. Thermocouples use the e.m.f. Cover the tip of the thermometer with a plastic sheath and apply lubricant, such as petroleum jelly or a water-based lubricant such as K-Y jelly. Most free phone apps designed to take temperature readings are meant for recording the temperature of environments, not people. 8. Tympanic readings are 0.5°F (0.3°C) to 1°F (0.6°C) higher than oral temperature readings. How Much Food Do You Feed An 8 Pound Dog? It is more durable than alcohol thermometer because mercury does not evaporate easily. Advantages of Alcohol Thermometer. It... What Are The Advantages & Disadvantages CONSTANT VOLUME GAS THERMOMETER? - Accurate ( uses ideal gas N2 and ideal gas law) Pacifier thermometers must remain in the mouth, without moving, for up to 6 minutes. Unlike electrical thermometers, they do not necessitate power supply or batteries for charging. Never use a thermometer on a person that is meant for another purpose, such as a laboratory or meat thermometer. What will happen to you when the government and the 57 percenters decide to move the economy ahead without any concessions for the 43 percenters /people on disability or social security? They can be hard to read and must stay in place for 3 minutes. Some manufacturers have. Wearing certain clothing, such as hats or heavy coats, can skew the results. There are many situations in which a temperature measurement is needed, and there is an equally wide variety of thermometers on the market. Mercury does not wet glass or cling to it, and this property, coupled with its uniform volume expansion throughout its liquid range, makes it useful in liquid-in-glass thermometers. LCTs, which depend on the change in colour of liquid crystals with temperature change, have been available in various forms since the early 1970s. It is one of the oldest thermometers available in the industry. Your sense of taste helps you evaluate food…. However, oral and forehead readings are also typically very reliable in these age groups. Mercury in glass thermometer advantages and disadvantages. Tympanic thermometers provide fast and accurate readings and may be preferable to oral or rectal thermometers, especially in children. Advantages are: for sticky liquid can also be measured, longer service life. They use the fact that most fluids expand on heating. First the kerosene thermometer, measurement range is about - 30 ℃ ~ 150 ℃, and the index value is bigger, cannot be measured accurately, the famous Galileo thermometer is kerosene thermometer. They provide readings within 8 to 10 seconds. 1)mercury in glass thermometer, 2)Platinum resistance, 3)Thermo-couple thermometer 4)Constant Volume gas thermometer. When assessing digital thermometer readings, keep in mind that armpit (axillary) temperature runs about ½ to 1°F (0.6°C) cooler than oral readings. You can also touch the forehead with some models. Using underarm temperature is a safe and effective…. This type of thermometer was developed by a German based physicist named Daniel Gabriel Fahrenheit.It consists of mercury as a liquid filled in a glass tube. 2. -It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly. 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. Thermocouples are usually used where quick response is required. ; It has wide temperature ranges. The alcohol rises and falls as it contracts or expands when a change in … 2. Infrared thermometers have three advantages. The thermocouple is less expensive than RTD. Turn the thermometer on and wait for it to tell you it’s ready. Advantages/Disadvantages. This is called Non-contact measurement. 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