⊕ Constrictions present in a thermometer are used for the following
О Constrictions prevent the level of the thermometric liquid to suddenly fall after measuring the temperature.
О The constriction hence conserves the reading of the thermometer for a certain period of time after which it falls .
О This allows the user to get enough time to read the readings of the level of the thermometer.
Θ Constriction are not present in lab thermometers
ОThe absence of constrictions help to measure the temperature readings accurately .
О In a laboratory the thermometer is generally required for measuring different instances of a chemical reaction
О The chemical reaction may change the temperatures very abruptly.
О Thus constrictions should interrupt the accurate and rapid changes in the thermometer.
О This also helps to read temperature in liquids because the temperature should rapidly change in such a case.
→ That's why constrictions are not present in laboratory thermometer
Hope it helps u :-)
It is due to that a chemical substance that will react only at a certain temperature. It may be at high temperature or low temperature. So to measure high and low temperature they use thermometer of 10° to 110°.
measure temperature of glass tube when be experiment doing .they are different from home thermometer.
I hope this answer helps you!