How does Thermometer Works?
Answer :
Thermometer works on the principle of Thermal Expansion. All metals expand with increase in temperature &vice versa i.e. decrease in size with decrease in temperature.
In a common thermometer as shown in figure above, in the bottom small bulb, Mercury ( a metal ) is kept. It is worth mentioning hat mercury is unique in the sense that
i. it is the only metal which is a liquid at room temperature &
ii. it coefficient of thermal expansion is pretty high i.e it the change in volume ( or length of a fix area liquid column is very large).
This mercury rise up and down in the thermometer tube with increase & decrease in temperature . The tube is marked with temperature readings and can be read directly.
How do we define 1*C temperature-
its simple As a convention it is assumed that the pure water boils at 100*C & gets converted into ice at 0*C.
The thermometer is kept in a boiling water. This gives us the mark of 100* C. Again, the thermometer is kept in an ice-water mixture. This gives us the 0*C mark.
The intermediate length between these 2 marks is divided into 100 parts. Each partitions corresponds to 1*C temp rise or decrease.
Engineering & Technology
Answer :
Thermometer works on the principle of Thermal Expansion. All metals expand with increase in temperature &vice versa i.e. decrease in size with decrease in temperature.
In a common thermometer as shown in figure above, in the bottom small bulb, Mercury ( a metal ) is kept. It is worth mentioning hat mercury is unique in the sense that i. it is the only metal which is a liquid at room temperature &
ii. it coefficient of thermal expansion is pretty high i.e it the change in volume ( or length of a fix area liquid column is very large).
This mercury rise up and down in the thermometer tube with increase & decrease in temperature . The tube is marked with temperature readings and can be read directly.
How do we define 1*C temperature-
its simple As a convention it is assumed that the pure water boils at 100*C & gets converted into ice at 0*C.
The thermometer is kept in a boiling water. This gives us the mark of 100* C. Again, the thermometer is kept in an ice-water mixture. This gives us the 0*C mark.
The intermediate length between these 2 marks is divided into 100 parts. Each partitions corresponds to 1*C temp rise or decrease.
