Table of Contents
- 1 What are the advantages and disadvantages of mercury thermometer?
- 2 What is the disadvantages of using mercury in thermometer?
- 3 What are the limitations of mercury in glass thermometer?
- 4 What are the disadvantages of mercury over alcohol?
- 5 What is the red stuff in a thermometer?
- 6 What is mercury free thermometer?
What are the advantages and disadvantages of mercury thermometer?
A thermometer comparison
| advantages | disadvantages |
|---|---|
| Mercury thermometer | |
| cheap | display is harder to read |
| durable | does not work below -39�C (Hg freezing pount) |
| accurate | cannot be used for thermograph |
What is the disadvantages of using mercury in thermometer?
The Weaknesses or the disadvantages of Mercury:
- 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.
- cannot be used for thermograph.
- slow response.
- fragile.
What are the limitations of mercury in glass thermometer?
Mercury has a freezing point of − 39°C and cannot be used in a thermometer below this temperature. Its boiling point is 357°C but before this temperature is reached some distillation of the mercury occurs if the space above the mercury is a vacuum.
What are the advantages and disadvantages of mercury over 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 are the advantages and disadvantages of mercury as a working fluid?
-It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly. -It does not wet (cling to the sides of) the tube. -It expands uniformly (linear expansion) and responds quickly to temperature changes, hence is sensitive. -It has a visible meniscus.
What are the disadvantages of mercury over alcohol?
It is less durable because alcohol evaporates faster than mercury. It cannot measure high temperature because of a low boiling point. It wets the walls of the thermometer, which can adversely impact the accuracy of readings.
What is the red stuff in a thermometer?
alcohol-based liquid and is marked with both a Celsius scale (left) and a Fahrenheit scale (right).
What is mercury free thermometer?
The mercury-free Geratherm Thermometer is an environmentally friendly, easy-to-read thermometer that provides clinical accuracy in a display that can be changed to read in degrees Fahrenheit or Celsius . The thermometer is used orally and contains Galinstan , which is a patented, Earth-friendly non-toxic substitute for mercury.
What is red liquid in thermometer?
“The red liquid inside of a thermometer is alcohol. When the temperature changes, the alcohol expands, providing a reading based on the thermometer’s scale. Red dye is used to color the clear alcohol so that someone is able to easily read the thermometer.”. As mentioned, mercury is no longer used in domestic thermometers.
What is Mercury in glass thermometer?
mercury thermometer – thermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheit ; mercury expands with a rise in temperature causing a thin thread of mercury to rise in the tube. mercury-in-glass thermometer.