Advertisements
Advertisements
प्रश्न
Why do we use Mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?
उत्तर
- We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.
- A small change in the temperature causes change in volume of a liquid.
- Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C.
- Water is transparent. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube.
- Due to this constraints it is not used as a thermometric liquid.
APPEARS IN
संबंधित प्रश्न
In thermometer when bulb comes in contact with hot object, liquid inside it ______.
The body temperature of a healthy man is;
The common laboratory thermometer is a ______ thermometer
All clinical thermometers have a ______ that prevents mercury from flowing back into the bulb.
A clinical thermometer indicates temperatures from a minimum of ______ °F to a ______ maximum of °F.
Before use, the mercury level in clinical thermometer should be below ______.
Fahrenheit scale is more sensitive that the Celsius scale.
We are advised to avoid keeping the clinical thermometer in the sun or near a flame. Why?
write a note on a digital thermometer.
In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?
