What are the disadvantages of using alcohol thermometer?
A thermometer comparison
|Alcohol thermometer (compared to a mercury thermometer)|
|lower freezing point (-114 C)||less durable (alcohol evaporates)|
|larger coefficient of expansion||alcohol can polymerise|
|less hazardous||fluid loss by evaporation hard to avoid|
What is a disadvantage of a mercury thermometer?
It cannot measure very low temperature, because its freezing point is high (-40ºC) Mercury is poisonous, so it harmful if its tube is broken. Its price is very high. display is harder to read.
What are the advantages of using alcohol inside thermometer?
The advantage of alcohol (ethanol) is that it has a very large thermal expansion coefficient. This results in a large change of the liquid column inside the capillary of the thermometer and contributes to the accuracy of the measurement.
Which thermometer is better mercury or alcohol?
Mercury has a greater coefficient of thermal expansion than alcohol. This means a column of mercury will expand and rise more than a column of alcohol for the same temperature change. As a result, you can get finer readings with mercury. … Mercury is poisonous, and a broken thermometer in the mouth is not good.
How accurate are alcohol thermometers?
Alcohol thermometers are also inexpensive and durable. They are typically not as accurate as mercury thermometers because of the alcohol’s susceptibility to evaporation, polymerization potential and capillary separation. Their primary advantage is safety to humans and the environment.
Which thermometer is the most sensitive?
Researchers from the Institute for Photonics and Advanced Sensing (IPAS) at the University of Adelaide developed the thermometer which uses light to measure temperature. They have been able to measure temperature with a precision of 30 billionths of a degree.
Is it illegal to have a mercury thermometer?
In 2001, California passed the California Mercury Reduction Act of 2001 (SB 633 – Sher). … The law also prohibited the sale or supply of mercury fever thermometers after July 2002. Mercury thermostats were banned from sale in California in January 2006.
Do alcohol and mercury thermometers read the same?
The operation of these two thermometers is based on the thermal expansion of a fluid. Both mercury and alcohol have different thermal expansion. … Therefore the temperature reading on a mercury thermometer will differ from the reading on the alcohol thermometer although the difference is usually small.
What is a drawback to thermocouple type thermometers?
➨(Disadvantages of thermocouple are): Non linearity, least stability, Low voltage, Reference is needed, least sensitivity etc. ➨(Disadvantages of RTD are ): Lower absolute resistance, expensive, current source needed, less rugged compare to thermocouples etc.
What is the alcohol used in thermometer?
The two common liquids used in liquid in glass thermometers are alcohol (ethanol) and mercury.
Can you calibrate an alcohol thermometer?
Make sure the sensing area is under water. Wait 30 seconds or until the reading stays steady. Adjust the thermometer so it reads 32˚F (0˚C). Hold the calibration nut securely with a wrench or other tool and rotate the head of the thermometer until it reads 32˚F (0˚C).
What are the benefits of alcohol?
Moderate alcohol consumption may provide some health benefits, such as:
- Reducing your risk of developing and dying of heart disease.
- Possibly reducing your risk of ischemic stroke (when the arteries to your brain become narrowed or blocked, causing severely reduced blood flow)
- Possibly reducing your risk of diabetes.