Aim: To measure the teperature of water with the help of laboratory thermometer. Also write necessary precautions while doing it.
Material Required:
Laboratory thermometer, Beaker, Water, Tripod stand, Spirit lamp
Procedure:
A. Measurement of Cold Water Temperature
l Take some cold water in a clean beaker.
l Immerse the bulb of the thermometer in the cold water without touching the sides or bottom of the beaker.
l Wait until the mercury level becomes steady.
l Read and record the temperature at eye level — this is the temperature of cold water.
B. Measurement of Hot Water Temperature (Using Spirit Lamp)
l Now, place the beaker on a tripod stand.
l Light the spirit lamp and gently heat the water.
l Keep heating until the water becomes warm to hot
l Carefully insert the bulb of the thermometer into the hot water without touching the sides or bottom of the beaker.
l Wait until the mercury level stops rising.
l Read and record the temperature at eye level — this is the temperature of hot water.
Observation Table:
S. No. | Condition of Water | Temperature (°C) |
1 | Cold water | 24 °C |
2 | Hot water | 40 °C |
Precautions:
1) The thermometer bulb should not touch the sides or bottom of the beaker.
2) Always read the thermometer at eye level.
3) Do not hold the bulb of the thermometer while taking readings.
4) Do not insert the thermometer while heating; remove the flame first.
5) Handle the thermometer carefully; it is fragile.
6) Avoid overheating the water — boiling may cause the thermometer to break.
7) Clean and dry the thermometer before and after use.
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