Q.1. State similarities and differences between the laboratory thermometer and the clinical thermometer.Ans. Similarities:

(i) Both thermometers consist of long narrow uniform glass tubes. (ii) Both have a bulb at one end. (iii) Both contain mercury in bulb. (iv) Both use Celsius scale on the glass tube. Differences: (i) A clinical thermometer reads temperature 35°C to 45°C while the range of laboratory thermometer is -10°C to 110°C. (ii) Clinical thermometer has a kink near the bulb while there is no kink in the laboratory thermometer. Due to kink mercury does not fall down on its own in clinical thermometer.