0
What is the thermometric property of liquid crystal thermometer?
Wiki User
∙ 14y ago
The thermal expansion of this liquid must be proportional to temperature; also corrosive, toxic and very colored liquids must be avoided if it is possible. These liquids doesn't react with glass.
Wiki User
∙ 6y ago
Hamza Waheed
Wiki User
∙ 16y agoThose thermometers use liquid crystals to measure temperature. More specifically, they use chiral nematic liquid crystals--long asymmetric molecules that arrange themselves in orderly spirals in the liquid. When light strikes these spiral structures, some of it reflects. But the reflection is strongest when the light's wavelength is an integer or half integer multiple of the spiral's pitch--the distance between adjacent turns of the spiral. Since light's wavelength is related to its color, the light reflected by these liquid crystals is colored. Because the pitch of a chiral nematic liquid crystal changes with temperature, so does its color. Slightly different liquid crystals are inserted behind each number on the thermometer so that each number becomes colored at a different temperature.
copied from:
http://rabi.phys.Virginia.edu/HTW/thermometers_and_thermostats.html
Wiki User
∙ 14y agoLiquid crystal thermometers offer a good approximation of temperature for a small range. Since the indicator may be bright for several values, though, you cannot say with certainty what the temperature actually is.
Wiki User
∙ 14y agocolor change.
-
are you by any chance in form 3?
Wiki User
∙ 11y agoliquid crystal thermometers use liquid crystals that change colour in response to temperature changes. just look it up. i will find something somewhere
Add your answer:
Earn +20 pts
What characteristics must a liquid have before it can be used in a thermometer?
One thermometric property that is required is that it must vary linearly with temperature. In liquid-in-glass thermometers, the length of the liquid thread is often used to determine temperature. Thus when temperature increases, the liquid must expand uniformly with temperature, so that it can be used to measure temperature accurately.
What is liquid-in-glass thermometer?
what do they use for the liquid in glass ball thermometer
How does a glass thermometer works?
As the liquid in the thermometer is heated it expands, and the only way the expanding liquid can go is upward. As the liquid in the thermometer cools, it will contract, and the liquid will fall back down into the resevoir, causing the column of liquid to move downward.
Why does the liquid expand in a thermometer when it gets hotter?
In a thermometer is a liquid metal called Mercury, so the liquid expands when it is heated up.
Why lab thermometer do not have kink?
the temparature of the liquid must be read while the thermometer is in the liquid.since the level of mercury drops as soon as the thermometer is taken out of the liquid ,therefore no need of the kink in thermometer.
What is the liquid in thermometer's called?
Mercury the liquid inside thermometer is mercury.. but it is called thermometric liquid.
What is the importance of thermometric liquids?
Thermometric liquid is the liquid found in the thermometer that help in the up and down movement of the temperature.
What is linearity of a thermometer?
Within the thermometer's range of operation, a given temperature difference will result in the same expansion in the column of the thermometric liquid.
What is the thermometric property used in a mercury thermometer?
Not just a property of liquid but of all matter. All matter expands when heated and contracts when cooled, in thermometers the liquid, usually an alcohol, expands when heated lengthening the little line.
Who invented liquid crystal thermometer?
big boy blue
Can i use liquid crystal thermometer to measure level of gas in a cylinder?
A thermometer is not adequate in this situation.
What characteristics must a liquid have before it can be used in a thermometer?
One thermometric property that is required is that it must vary linearly with temperature. In liquid-in-glass thermometers, the length of the liquid thread is often used to determine temperature. Thus when temperature increases, the liquid must expand uniformly with temperature, so that it can be used to measure temperature accurately.
Is there any thermometer which changes its colour due to temperature change?
Yes,its called as "liquid crystal thermometer".
Why you can not use another liquid in a thermometer?
We cannot use other liquids in thermometer since it may not have a wide range of temperature for remaining in the liquid state. It may stick to the glass of the thermometer. It may be transparent. The liquid may not be sensitive to thermal expansion and may not have a uniform expansion with heat. The liquid may not be a good conductor of heat.The liquid may not be found in pure form. Hence mercury is the best liquid as a thermometric liquid.
Why is mercury preferred to alcohol as a thermometric fluid?
what are the qualities of mercury over alchoholic as thermometric liquid
What is the name of the liquid in a thermometer?
The red liquid in a liquid-in-glass thermometer is mineral spirits or ethanol alcohol mixed with red dye. A grey or silver liquid inside the thermometer is mercury. Mercury thermometers are not used anymore due to the dangers associated with mercury.
Different kinds of thermometer and their uses?
Different types of thermometer and their uses 1. liquid-in-glass thermometer: weather recording and laboratory uses. (Temperature sensor: laboratory uses.<--this may not count as one of the thermometers XD ) 2. infra-red thermometer: measuring body temperature. 3. rotary thermometer: measuring the temperature of ovens and freezers. 4. resistance thermometer: measuring temperatures from -200 degree C to 1000 degree C, e.g. engines and ovens, etc. 5. thermistor thermometer: measuring the temperature of human body and electrical appliances. 6. liquid crystal thermometer: measuring the temperature of human body and fish tanks. ( the color of liquid crystal changes with temperature.)
