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What is the purpose of constriction in the clinical thermometer?

It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb. This helps for examle when one wants to know the body temperature of a patient he/she puts the thermometer in the suitable place to take the reading for sometime and then retrieves it to take the reading now the constriction prevents the thermometric substance from running back into the bulb so that you can see & or record the correct temperature. 
Without the costriction the thermometric substance wouldve ran back into the bulb as soon as the user wanted to make a temp. & so with the costriction, you can teke a reading whereas the thermometric liquid in the bore moves only if you shake the thermometre vigorously or let it stay in room temp for several minutes.
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When the mercury in the tube expands as the thermometer temperature goes up in the mouth (or wherever), it is forced past the constriction. When the doctor (or whoever) wants to look at it, they don't want it going down again while they're reading it. The constriction stops this happening. This is why the thermometer has often to be shaken before taking the temperature - to get the mercury back into the bulb area. Ordinary thermometers don't need this sort of thing, because you read them where they are, not taken out and changing.

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When the mercury in the tube expands as the thermometer temperature goes up in the mouth (or wherever), it is forced past the constriction. When the doctor (or whoever) wants to look at it, they don 't want it going down again while they 're reading it. The constriction stops this happening. This is why the thermometer has often to be shaken before taking the temperature - to get the mercury back into the bulb area. Ordinary thermometers don 't need this sort of thing, because you read them where they are, not taken out and changing.It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb. This helps for examle when one wants to know the body temperature of a patient he/she puts the thermometer in the suitable place to take the reading for sometime and then retrieves it to take the reading now the constriction prevents the thermometric substance from running back into the bulb so that you can see & or record the correct temperature.

Without the costriction the thermometric substance wouldve ran back into the bulb as soon as the user wanted to make a temp. & so with the costriction, you can teke a reading whereas the thermometric liquid in the bore moves only if you shake the thermometre vigorously or let it stay in room temp for several minutes.
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It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb. This helps for examle when one wants to know the body temperature of a patient he/she puts the thermometer in the suitable place to take the reading for sometime and then retrieves it to take the reading now the constriction prevents the thermometric substance from running back into the bulb so that you can see or record the correct temperature.Without the costriction the thermometric substance wouldve ran back into the bulb as soon as the user wanted to make a temp. so with the costriction, you can teke a reading whereas the thermometric liquid in the bore moves only if you shake the thermometre vigorously or let it stay in room temp for several minutes.

When the mercury in the tube expands as the thermometer temperature goes up in the mouth (or wherever), it is forced past the constriction. When the doctor (or whoever) wants to look at it, they don 't want it going down again while they 're reading it. The constriction stops this happening. This is why the thermometer has often to be shaken before taking the temperature - to get the mercury back into the bulb area. Ordinary thermometers don 't need this sort of thing, because you read them where they are, not taken out and changing.It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb. This helps for examle when one wants to know the body temperature of a patient he/she puts the thermometer in the suitable place to take the reading for sometime and then retrieves it to take the reading now the constriction prevents the thermometric substance from running back into the bulb so that you can see or record the correct temperature.

Without the costriction the thermometric substance wouldve ran back into the bulb as soon as the user wanted to make a temp. so with the costriction, you can teke a reading whereas the thermometric liquid in the bore moves only if you shake the thermometre vigorously or let it stay in room temp for several minutes.(PLEASE RATE ME)
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It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb.
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The constriction in the thermometer is to prevent the mercury from dropping back to the bulb when the reading is being taken. It is easier for us to take reading.
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U all are giving bakwas ans
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it prevents the thermometric liquid mercury to fall off in the bulb again 
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It prevents the thermometric substance (Mercury or Alcohol) from running back into the bulb. This helps for examle when one wants to know the body temperature of a patient he/she puts the thermometer in the suitable place to take the reading for sometime and then retrieves it to take the reading now the constriction prevents the thermometric substance from running back into the bulb so that you can see & or record the correct temperature. Without the costriction the thermometric substance wouldve ran back into the bulb as soon as the user wanted to make a temp. & so with the costriction, you can teke a reading whereas the thermometric liquid in the bore moves only if you shake the thermometre vigorously or let it stay in room temp for several minutes.
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