(a) A clinical thermometer has small temperature range. The glass will crack/burst due to excessive pressure created by expansion of mercury.
Why is not advisable to sterilize clinical thermometer in a boiling water?
Clinical thermometers have a very small range, being from 20ºC to 45ºC in general. If placed in boiling water, which is 100 degrees, damage will be caused to the thermometer, either melting it or changing the properties of the catalyst inside.
What will happen if we put a clinical thermometer in boiling water?
When a thermometer is placed in boiling water, the mercury is heated up and it in turn heats the inner portion of the glass. … Therefore, the inside layer of glass expands but not the outer layer and hence it breaks.
How clinical thermometer is sterilized?
The sterilizing solution used with the storage container is propylene glycol with up to 50 percent by volume of water or ethanol. This solution serves to cold sterilize the thermometer and additionally lubricates the same sufficiently for insertion into a patient’s rectum.
Which thermometer should never be washed with dirty water?
Clinical thermometer should never be washed with dirty water.
Why is a clinical thermometer not used to measure the temperature of boiling milk?
We cannot use a clinical thermometer to measure the temperature of boiling milk because the range in a clinical thermometer varies only between 35 degree celsius to 42 degree celsius the temperature of boiling water will rise above this limit, a clinical thermometer cannot be used to measure its temperature.
Why we Cannot use laboratory thermometer to measure body temperature?
A laboratory thermometer cannot be used to measure the human body temperature. This is because as soon as we take out the bulb of the laboratory thermometer from our mouth, the level of mercury in its tube will start falling quickly. This will give a wrong value of the body temperature.
When the clinical thermometer can break?
Answer: The temperature over 42°C can be break the clinical thermometer.
Why is water not used in thermometer?
Water is not able to be used as a thermometer liquid because of its higher freezing point and lower boiling point than the other liquids in general. … This range is very negligible as compared to other liquids like mercury which has a freezing point of about −39∘C and boiling point 356∘C.
Why do we sterilize thermometer?
It’s important to clean a thermometer before and after using it to prevent the spread of germs.
How is a clinical thermometer different from a laboratory thermometer?
Clinical thermometer is used to measure the human body temperature. A laboratory thermometer is not used for this purpose of measuring body temperature; it is generally used for the measurement of objects which generally have a temperature range outside that of a normal human body.
Can you put a thermometer in boiling water?
The Boiling-Water Method
Bring water to a rolling boil in a deep saucepan. Place the stem of the thermometer in the boiling water. Again, make sure that it’s submerged at least 2 inches and wait at least 30 seconds. Your thermometer should read 212°F or 100°C.