Physics Information on Temperature

THE OXFORD SCHOOL , DUBAI

LEARNING OBJECTIVES:      Appreciate how a physical property that varies with temperature may be used for the measurement of temperature, and state examples of such properties. Recognise the need for and identify fixed points. Describe the structure and action of liquid-in-glass thermometers. Demonstrate understanding of sensitivity, range and linearity. Describe the structure of a thermocouple and show understanding of its use for measuring high temperatures and those that vary rapidly.

1. A clinical thermometer is designed to respond quickly to a change in temperature and to have a high sensitivity.

Which design features should the clinical thermometer have?

2. A liquid-in-glass thermometer consists of a bulb containing a liquid. The liquid can expand into a very thin capillary tube.

PREPARED BY PREETI MANOJ

THE OXFORD SCHOOL , DUBAI

The liquid in the thermometer is replaced by another liquid that expands more for the same temperature rise. The new thermometer will have A. B. C. D. 3. greater sensitivity and greater range. greater sensitivity but less range. the same sensitivity and the same range. the same sensitivity but greater range. Fig. 3.1 shows a thermometer.

(a) Explain how to calibrate a thermometer. .................................................................................................................................................................... ................................................................................................................................................................... ................................................................................................................................................................... ..................................................................................................................................................................