[Legacy] Temperature and Thermometry

Suggest an appropriate material for:

• X ______
• Y ______
• Z ______

State the physical property of a thermocouple thermometer that is used in this way.

Discuss what is meant by the term linearity when applied to a thermocouple thermometer.

State two advantages of a thermocouple thermometer over a liquid-in-glass thermometer.

1. ______
2. ______

State what makes a physical property suitable for the measurement of temperature.

State two properties that are used for the measurement of temperature.

1. ______
2. ______

One fixed point is the ice point. State what is meant by the ice point.

Explain how the fixed points are used when calibrating a thermometer.

State the range of the thermometer shown in Fig. 4.1.

______

Describe how Fig. 4.1 shows that the thermometer has a linear scale.

The manufacturer of the thermometer changes the design to make a more sensitive thermometer.

Fig. 4.2 shows part of the scale on the original thermometer.

On Fig. 4.3, draw a more sensitive scale.

State one other property, apart from volume or expansion, which can be used to measure temperature.

______

Draw a labelled diagram to show the structure of a liquid-in-glass clinical thermometer.

A clinical thermometer is used to measure the temperature of a patient. When removed, the thermometer cools but it continues to show the maximum temperature reached.

Explain how this happens.

State what, for a thermocouple thermometer, is meant by a linear output.

The junction inside the furnace is at temperature $T$. Fig. 2.2 shows the reading $V$ of the voltmeter at two values of $T$ that are within the operating temperature range of the furnace.

Fig. 2.2

When the furnace is operating at a high temperature, the furnace door is opened and the reading of the voltmeter falls to 6.80 mV.

Calculate the temperature of the junction inside the furnace.

temperature = ______

State why a liquid-in-glass thermometer is not used to measure the temperature inside the furnace.

On Fig. 3.1, draw a labelled diagram of the structure of the thermocouple thermometer as it measures the temperature in the flame.

Describe how the fixed points and the reading of the voltmeter are used to determine the value of the temperature in the flame.

The thermocouple thermometer is used to measure the temperature in the flame because it can measure very high temperatures. State and explain one other advantage of using a thermocouple thermometer to determine temperature.

range,

low sensitivity.

State one change in the design of a thermometer that increases its sensitivity.

State the range of the thermometer.

State one change in the design of the thermometer to increase its range.

Describe how the behaviour of a more sensitive thermometer is different from a less sensitive thermometer.

State one change in the design of the thermometer to make it more sensitive.

Describe how a clinical thermometer differs from a laboratory thermometer. A diagram may be included in your answer.

In the space below, draw a labelled diagram of a thermocouple thermometer.

State two reasons why a thermocouple thermometer is sometimes a better choice than a laboratory thermometer.

State what is meant by

1 range,

2 sensitivity.

State and explain one feature of this clinical thermometer that produces a high sensitivity.

State the purpose of the constriction in the clinical thermometer.