can we use a clinical thermometer to check the temperature of a boiling water (water that is boling).
Explain.
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Answers
Answer:
No,we cannot use
Explanation:
No, A clinical thermometer cannot be used to check the temperature of a boiling water as the clinical thermometer has range less than the boiling point of water. When the clinical thermometer is placed at the hot water, it will be destroyed because of high temperature.
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Answer:
we cant
Because the bulb would burst. That's the *easy* answer.
Why would it burst? There is no expansion space at the top, for mercury to go into, if the thermometer was exposed to a temperature above it’s scale maximum. The bulb has a thin wall and is the weakest part.
Why no expansion space? Most thermometers have one at the top. Mercury does not wet glass and if it is in the expansion space, its high surface tension prevents it returning into the fine bore tube.
But most mercury thermometers have an expansion space. Alcohol thermometers always have an expansion space.
These types have gas under pressure. Clinical thermometers have a vacuum above the mercury.
Why a vacuum? So that the mercury column can separate just above the bulb, to hold the reading as the thermometer cools. Without it, air pressure above the mercury would push it down as it cooled and the reading would no longer be valid.
How does the column break? There is a wider part just above the bulb with a jagged internal edge. Friction from the mercury in the fine column above is enough so the column separates in this wider part as it cools, but only if there is no gas pressure above to push the mercury down. To get the mercury to return to the bottom, the thermometer must be shaken. There is a risk of breakage whilst doing this...
So back to the original question; if not by hot water, how can they be sterilised? A wipe with alcohol or lukewarm soapy water is all that is needed.