Clinical thermometer:
1. Wash the clinical thermometer properly with an antiseptic solution.
2. To lower the mercury level, hold the thermometer firmly and give some jerks.
3. Ensure that it falls below 35°C. Now place the bulb of the thermometer under your tongue.
4. After one or two minutes, take the thermometer out and note the reading.
5. This is your body temperature.
6. Don’t hold the thermometer by the bulb while reading it.
Laboratory thermometer:
1. Take cold or hot water in a bowl. Place the mercury bulb of the thermometer in the water so that the bulb immerses in it.
2. Wait for some time till the mercury level shows a constant
Digital Thermometer:
1. It works without mercury.
2. It has a display which shows readings directly.
3. It is very easy to use it.
4. We can use it by just pressing on/off button present on it.
5. Even children can also handle this one.
Six’s maximum and minimum thermometer:
1. It is one of the Meteorological Instruments used to measure maximum (highest) and minimum (lowest) temperatures of a place in a day.
2. It has a cylindrical ‘Bulb A’, and ‘Bulb B’ connected through a ‘Ushaped tube’ containing mercury.
3. Bulb A contains alcohol, and bulb B contains alcohol and its vapours.
4. When the temperature increases, the alcohol in the bulb A expands and pushes the mercury in the U tube, this makes indicator(M) to move up.
5. This indicates the maximum temperature of the day.
6. When the temperature decreases, alcohol in the bulb A contracts and pulls the mercury back.
7. This makes indicator (N) to move up.
8. This indicates the minimum temperature of the day.
9. After taking readings the indicators M and N are brought to their original places by using a magnet.
