Temperature and its Measurment

Temperature and its measurment

Temperature and its measurment-Temperature is the degree of hotest or coldest of a body or place.it is measured with an instrument called thermometer. the SI unit of temperature is Kelvin(K)

Scale of Temperature-the common used scale to measure temperature are Celsius,Fahrenheit,Kelvin scale.

Celsius-This scale has a range from 0°C to 100°C where 0°C is the melting point of ice and 100°C is the boilling point of water.

Fahrenheit-32°F to 212°F where32°F is the melting point of ice and 212°F is the boilling point of water.

What is the temperature at which Celsius equals Fahrenheit?

At -40° Celsius temperature is equal to Fahrenheit temperature
F=9/5 C +32
Since F=C
C=9/5C+32
C-9/5C=32
(5C-9C)/5C=32
-4C/5C=32
>-4C=32 x 5C
-4C=160C
-4=160
—40°F
So the temperature when both the Celsius and Fahrenheit scales are the same is -40 degrees.

FACT-Mercury is the only metal that exists as a liquid at room temperature

Why Mercury is used in the thermometer?

It remains in the liquid state for a wide range of temperature.

it is easy to see because it has a silvery-gray colour.

It does not stick to the glasse.

It has a fairly uniform rate of expansion for a wide range of temperature