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Observe carefully the thermometer available in your school. It is a long glass tube with a thin internal glass tube of equal diameter filled with mercury. One end of the tube is joined with bulb and other end is closed. Thermometer has printed scale on which is generally a Celsius scale. In Celsius scale, temperature is expressed in °C. Observe the thermometer carefully, and find out the highest and lowest scale value on it.In the laboratory thermometer, normally -10 °C to 110 °C makings are seen. It is called the range of the thermometer. How is temperature measured by a thermometer?1. Observe carefully laboratory thermometer and fill the maximum and minimum values/ temperature printed on it?2. How is temperature measured by thermometer? |
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Answer» 1. On the laboratory thermometer, the maximum value printed is 110°C and the lowest value is -10°C Usually a laboratory thermometer has -10° C to 110° C mark on it. It is called the range of thermometer. 2. Dip the bulb of thermometer in a liquid and wait till the level of mercury become stable. Note this reading. It is the temperature of that liquid. Let us do and observe Dip the bulb of thermometer in the three pots A, B and C (filled with water) respectively. In activity-1 and wait, till the level of mercury becomes stable. Conclusion: We observe that the temperature of pot C is the maximum, temperature of water in Pot B is less than of C, while the temperature of water in pot A is the minimum (below 0°C). |
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