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What do thermometers contain?
Thermometers contain a temperature-sensitive substance, typically mercury or alcohol, which expands or contracts with changes in temperature. This expansion or contraction is then measured on a scale to indicate the temperature.
Why 70 ethanol is used as disinfectant?
a) 70% ethanol has been found to b most effective in killing microbes.Higher or lower concentrations may not b as effective. b) if u use 90% or absolute ethanol, it will evaporate fast and may not be much effective. c) using higher concentrations will leave its traces on the applied surfaces d) higher concentrations of ethanol are harmful to skin and makes it dry pretty a) 70% ethanol is most effective.higher or lower ones r not as effective b) it evaporates at a slow rate than 90% or absolute ethanol. therefore it is more effective and saves ur ethanol too.. c) higher concentrations alwez leave traces applied surfaces thus addind an unwanted reagent d) 70% ethanol is comparatively less harmful to ur hands.. higher concentrations makes ur skin dry..
What conditions are needed to make ethanol from ethene and steam?
To produce ethanol from ethene and steam, you would need to carry out a catalytic hydration reaction using a suitable catalyst like phosphoric acid on silica or zeolite-based catalysts. This process requires high temperatures (150-300°C) and pressures (50-70 atm) to favor the formation of ethanol from ethene and steam. The reaction must be carefully controlled to prevent further reaction of ethanol to form undesirable byproducts.
Is it possible to have an absolute alcohol from ninety percent ethanol using fractional distillation?
No, it is not possible to achieve absolute alcohol (100% ethanol) through fractional distillation of a 90% ethanol solution. Fractional distillation can only separate the components present in the solution, not create new ones. To obtain absolute alcohol, additional methods such as azeotropic distillation or molecular sieves are needed.
What is ethanol used for?
Ethanol is used for fuel, or other various things.(That is not an answer!)Ethanol is a biofuel. BIOFUELS are widely considered a way to reduce greenhouse gases from fossil fuel use and thereby reduce human-caused global warming.Although ethanol is a common form of alcohol, the largest single use of ethanol is as a motor fuel and fuel additive.Compared to petrol, ethanol cuts poisonous gas emissions (carbon monoxide, nitrous oxides, sulfur dioxide) and produces fewer greenhouse gases that cause global climate change. Added to petrol, ethanol also reduces ground-level ozone formation by lowering the poisonous emissions from petrol combustion.Ethanol is made by fermenting and then distilling starch and sugar crops -- maize, sorghum, potatoes, wheat, sugar-cane, even cornstalks, fruit and vegetable waste.Many countries produce ethanol - the main ones being: Brazil, United States of America and China.Today, almost half of Brazilian cars are able to use 100% ethanol as fuel produced from domestically grown sugar cane. But environmentalists warn that the demand for sugar cane is a disaster for the Amazon rain forest as huge areas are cleared for agricultural use.Expanding large-scale agriculture to grow sugarcane, critics say, will worsen the loss of species diversity, water-quality problems, and habitat fragmentation in some of the world's most biologically diverse regions.Other opponents, environmentalists and livestock farmers say that increased ethanol production won't meet energy goals and may damage the environment, while at the same time causing worldwide food prices to soar as food crops are turned into ethanol.Other researchers report that the production of ethanol consumes more energy than it yields.One of the advantages of producing ethanol is very little is wasted. With sugar cane, for example, the leftover pulp is utilized in power plants as a surprisingly efficient fuel to produce electricity.Use these links for more information about Bioethanol:http://www.sciencenewsforkids.org/articles/20060412/Feature1.aspCrops as an Energy Source-Bunneh
Why is mercury not used in thermometers any more?
Mercury is toxic and poses serious health and environmental risks if spilled. As a result, many countries have phased out the use of mercury in consumer products, including thermometers. Safer alternatives, such as digital thermometers, are now widely used instead of mercury-based ones.
Why is mercury rarely use in thermometers for body trmperatures?
Mercury is poisonous... If the thermometer is broken - it could cause harm. It's safer to use alcohol thermometers - or electronic ones.
What material is used for thermometer?
Thermometers can be made from various materials, but common ones include glass, mercury, alcohol, and digital sensors such as thermocouples and resistive temperature detectors. Glass thermometers often contain mercury or alcohol as the temperature-measuring substance. Digital thermometers use semiconductor materials for temperature sensing.
Why is mercury not suitable for thermometers in Canada?
Mercury is not suitable for thermometers in Canada because it is toxic and poses environmental and health risks if it is released. In addition, being a liquid at room temperature, mercury may expand and contract too much with changes in temperature, affecting the accuracy of the thermometer readings. These factors have led to the phasing out of mercury thermometers in many countries, including Canada.
What do thermometers contain?
Thermometers contain a temperature-sensitive substance, typically mercury or alcohol, which expands or contracts with changes in temperature. This expansion or contraction is then measured on a scale to indicate the temperature.
Is mercury a pure or mixed substance?
Mercury is an element, which means it is pure. But sometimes it can probably have other metals or chemicals or impurities in it. Most thermometers use alcohol or are electronic now, mercury ones aren't used as much.
Why is mercury used in clinical thermometers?
These days, mercury is considered too risky to use in thermometers (due to the risk of them breaking and contaminating people). Alternate techniques are used today in clinical thermometer, including electronic thermometers and ones based on liquid crystals that aren't as harmful should they leak out and even contactless infrared thermometers..Mercury was used in clinical thermometers due to:Its high thermal expansion (25 °C) 60.4  µm·m−1·K−1Linearity in thermal expansionSensitivity to rise in temperature
Why mercury used in clinical thermometer?
These days, Mercury is considered too risky to use in thermometers (due to the risk of them breaking and contaminating people). Alternate techniques are used today in clinical thermometer, including electronic thermometers and ones based on liquid crystals that aren't as harmful should they leak out and even contactless infrared thermometers..Mercury was used in clinical thermometers due to:Its high thermal expansion (25 °C) 60.4  µm·m−1·K−1Linearity in thermal expansionSensitivity to rise in temperature
How long should you keep the thermometer under your tongue?
You must hold your mouth closed and keep the thermometer in place for a certain period of time. If you have a digital thermometer, it will tell you when it's "done". If you are using an old "mercury thermometer", the thermometer must stay under the tongue for at least a minute to 2 minutes.NOTE: Mercury thermometers are being phased out. The mercury inside is highly toxic and you should dispose of all mercury thermometers by taking them to a recycling center that handles that. DO NOT THROW IT IN THE TRASH. Mercury is poisonous to every living thing.UPDATE: GERATHERM offers MERCURY FREE thermometers that work the same as the mercury ones. They are supposed to be safe.
How are homemade thermometers different from commercial versions?
The homemade ones have not been calibrated while the commerical ones have been.
Mercury Telluride has double bond or Single Bond?
Mercury telluride is probably an ionic compound, so "neither" is a better choice than either of the ones listed.
Who name the Mercury?
The ones who discovered the element Mercury were the ancients
