Table of Contents
What is the thermometric property of the thermometer?
The property of an object which changes with temperature is called a thermometric property. The devices used to measure temperature are called thermometers….Thermometry and Calorimetry:
| Heat Energy | Temperature and its Measurement |
|---|---|
| Thermometric Property | Thermometers |
| Thermal Expansion | Thermal Equilibrium |
| Triple Point of Water | Specific Heat Capacity |
What are the properties of alcohol as a thermometric liquid?
Advantages of using alcohol over mercury as thermometric liquid are: i) Alcohol has greater value of temperature coefficient of expansion than mercury. ii) it’s freezing point is below –100°C. Thus, alcohol thermometer is more sensitive than mercury thermometer and can be used to measure the temperature below –40°C.
What alcohol is in a thermometer?
The liquid used can be pure ethanol, toluene, kerosene or isoamyl acetate, depending on manufacturer and working temperature range. Since these are transparent, the liquid is made more visible by the addition of a red or blue dye.
How does an alcohol thermometer work?
Glass bulb thermometers work because liquids, such as water, alcohol, or mercury, expand slightly when the temperature rises. If the liquid is trapped in a narrow tube, it has nowhere to go but up.
What are the thermometer properties?
Thermometric Properties Used In Various Thermometers
| Thermometric Property | Thermometer |
|---|---|
| Volume expansion of a liquid | Laboratory or clinical thermometer |
| Volume expansion of a solid | Bi-metallic strip thermometer |
| Pressure change of a fixed mass of gas | Constant – volume gas thermometer |
| Changes in e.m.f. | Thermocouple |
What are the disadvantages of alcohol as a thermometric liquid?
it has low boiling point and higher freezing point and has poor thermal conductivity.
What are the advantages of alcohol thermometer?
A thermometer comparison
| advantages | disadvantages |
|---|---|
| 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 |
How accurate is an alcohol thermometer?
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.
What are the disadvantages of alcohol thermometer?
Why can’t you take your temperature with your hand?
The lower (closer to sea level) in the atmosphere you go, the greater the atmospheric pressure. IF you feel feverish, why can’t you take your own temperature with your hand? Because mecury is denser it can handle more atmospheric pressure.
What are the advantages of using alcohol in a thermometer?
Advantages of Alcohol Thermometer It can measure low temperatures. It measures the temperature precisely. The expansion of alcohol is regular. It is less toxic and less hazardous.
What is the alcohol used to make thermometer?
Traditional thermometers measure the temperature using mercury , but you can make your own at home with just water and rubbing alcohol. While the homemade thermometer can’t be used to tell if you have a fever, you can still find out how hot or cold it is around your home.
Can you use alcohol in a thermometer?
Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. Unlike mercury in the mercury thermometer, alcohol is less toxic and evaporates quickly. But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures.
What is an alcohol thermometer used to measure?
Alcohol thermometer is a type of thermometer that uses a bulb filled with alcohol as the temperature sensor. The liquid inside the bulb can be pure ethanol, toluene, kerosene or any other suitable component depending on the application. Alcohol thermometers are used to measure temperatures from -115°C to78.5°C .