¤ Alcohol thermometers can be used to measure very low temperatures. less hazardous. Alcohol thermometers can measure temperatures ranging from -115°C to78.5°C. Alcohol Thermometer Advantages and Disadvantages Advantages It is suitable to measure low temperatures because of its freezing point is low. It is a kind of thermometer with alcohol inside the bulb of the glass tube, which acts as a temperature detector. We do not implement these annoying types of ads! But it becomes lethal in a gaseous state like inorganic salts and organomercuric compounds, and it has considerable toxic effects on fetuses, infants, and children. hand2mind - 23033-6 Low-Range, Dual-Scale, Mercury-Free, Safety Thermometers for Indoor Science Use (Pack of 6) 4.1 out of 5 stars 346. We should avoid the bulb exposing to unnecessary temperature extremes when taking readings. The toxicity of alcohol in the alcohol thermometer is relatively low; conversely, the toxicity of mercury in mercury thermometers is high. The components used in the alcohol thermometers are colorless or transparent hence uses dyes for the liquid such as blue or red dye to make it more visible. Alcohol thermometer and mercury thermometer are two types of thermometers which are composed of a bulb and a marked glass tube. The measurable temperature range varies according to the used fluid inside the bulb. Thus, this is widely used in laboratories to measure the temperature variations of chemical reactions. Most commonly used alcohol in these is ethanol, but different types of alcohols can be used depending on the measured temperature and environment in which the measurements are taken. It is less expensive than a mercury thermometer. Their primary advantage is safety to humans and the environment. Since mercury has a higher boiling point than alcohol, mercury thermometer can be used to measure high temperatures. It has a greater value of temperature coefficient of expansion than a mercury thermometer. Therefore, mercury thermometers are best at measuring higher temperatures than the lower temperatures. Follow him on Twitter @HarlonMoss. Tonight, I bought and added a digital thermometer because I needed the hydrometer feature. Capillary present at halfway of the thermometer glass is enameled in yellow or white color to provide a base to the marked scale. If the temperature of the mercury is increased, it will expand indicating a height in the capillary tube. He graduated from the University of California in 2010 with a degree in Computer Science. It can measure the temperature precisely, because it has large expansion coefficient. We find the temperature by reading the marker where the meniscus is. Help me make videos by donating here: https://www.patreon.com/CodysLab The wall of the bulb is made extremely thin, to minimize the temperature gradient between mercury … However, they have differentiated as; the bulb of alcohol thermometer contains alcohol inside it, which is less toxic, whereas the bulb of mercury thermometer has mercury inside, which is highly toxic. FREE Shipping on orders over $25 shipped by Amazon. To get accurate readings, this must be avoided. The measurement range of alcohol thermometer depends on the boiling point of the liquid present in it. 1. The magnitude of the liquid (alcohol) extends while the bulb of the alcohol is exposed to the sample which needs to measure. The toxicity of liquids present in alcohol thermometers is less toxic because they are susceptible to evaporation. When we divide the linear scale in say, 100 parts, then basically what we are doing is that we are assuming that the measuring substance expands linearly with a rise in temperature. The mercury liquid does not require a dye and recognized by its natural metallic silver color. It is a kind of thermometer with mercury inside the bulb of the glass tube, which acts as a temperature detector and also referred to as a mercury-in-glass thermometer. Liquids such as pure alcohol, kerosene, and toluene can be present within the bulb of alcohol thermometer; however, mercury is the only liquid that can be present inside the bulb of a mercury thermometer. Normalerweise werden die Temperaturen in Grad Celsius oder Grad Fahrenheit gemessen. The alcohol thermometer is reading 98 degrees, while the digital is reading 95.4 degrees. As with a mercury-in-glass thermometer, it is easy to skew the reading of an alcohol thermometer by heating or chilling the bulb which holds the reserve fluid. The endurability of alcohol thermometers is relatively less because it is susceptible to evaporation, whereas the endurability of alcohol thermometers is high as mercury is resistant to evaporation. We don't have any banner, Flash, animation, obnoxious sound, or popup ad. @media (max-width: 1171px) { .sidead300 { margin-left: -20px; } } Since mercury has a higher boiling point than alcohol, mercury thermometer … Alcohol thermometers have alcohol inside the bulb of the thermometer, whereas mercury thermometer has mercury enclosed in the bulb of a thermometer. Sometimes we have to measure the temperature lower than -38.8°C As the temperature increases, the fluid expands and rises up the capillary. As alcohol has a low boiling point, it wets the wall of alcohol thermometer of its place, while the mercury in the mercury thermometer does not wet the walls of the thermometer glass. 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