Define thermocouple .

A thermocouple is a temperature sensor made of two wires of different metals joined at two junctions; a temperature difference between the junctions produces an e.m.f. that can be measured.

Name four physical properties, each used by a different type of thermometer, that vary with temperature.

Density of a liquid Volume of a gas at constant pressure Resistance of a metal E.m.f. of a thermocouple

How does the resistance of a thermistor change as its temperature increases?

It decreases , and the relationship between resistance and temperature is non-linear .

At what two temperatures are thermometers commonly calibrated?

The melting point (0 °C) and boiling point (100 °C) of water.

A liquid-in-glass thermometer depends on the .......... change of a liquid within the tube as temperature changes.

A liquid-in-glass thermometer depends on the density change of a liquid within the tube as temperature changes.

True or False? The e.m.f. produced by a thermocouple is directly proportional to the temperature difference between its junctions.

False. The e.m.f.–temperature relationship for a thermocouple is non-linear (a curved graph), so a thermocouple must be calibrated.

Define absolute zero .

Absolute zero (0 K) is the lowest possible temperature, at which the average kinetic energy of molecules is at its minimum.

Why is the thermodynamic (Kelvin) temperature scale described as an absolute scale?

Because it does not depend on the properties of any particular substance , unlike the Celsius scale, which is based on the properties of water.

How does a change in temperature of 1 K compare with a change in temperature of 1 °C?

They are equal — the divisions on the Kelvin and Celsius scales are the same size.

The Celsius scale is based on the properties of .......... , with the freezing point taken as 0 °C and the boiling point as 100 °C.

The Celsius scale is based on the properties of water , with the freezing point taken as 0 °C and the boiling point as 100 °C.

True or False? A temperature in kelvin can be negative, in the same way that a temperature in degrees Celsius can be negative.

False. Absolute zero (0 K) is the lowest possible temperature, so a temperature in kelvin can never be negative .

A LevelPhysicsCambridge (CIE)Flashcards14. TemperatureTemperature Scales

Temperature Scales (Cambridge (CIE) A Level Physics): Flashcards

Exam code: 9702

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FrontMeasurement of Temperature
Define thermocouple.
FrontMeasurement of Temperature
Name four physical properties, each used by a different type of thermometer, that vary with temperature.
BackMeasurement of Temperature
Density of a liquid
Volume of a gas at constant pressure
Resistance of a metal
E.m.f. of a thermocouple

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Cards in this collection (13)

Define thermocouple.
A thermocouple is a temperature sensor made of two wires of different metals joined at two junctions; a temperature difference between the junctions produces an e.m.f. that can be measured.
Name four physical properties, each used by a different type of thermometer, that vary with temperature.
- Density of a liquid
- Volume of a gas at constant pressure
- Resistance of a metal
- E.m.f. of a thermocouple
How does the resistance of a metal change as its temperature increases?
It increases at a steady rate.
How does the resistance of a thermistor change as its temperature increases?
It decreases, and the relationship between resistance and temperature is non-linear.
At what two temperatures are thermometers commonly calibrated?
The melting point (0 °C) and boiling point (100 °C) of water.
A liquid-in-glass thermometer depends on the .......... change of a liquid within the tube as temperature changes.
A liquid-in-glass thermometer depends on the density change of a liquid within the tube as temperature changes.
True or False?
The e.m.f. produced by a thermocouple is directly proportional to the temperature difference between its junctions.
False.
The e.m.f.–temperature relationship for a thermocouple is non-linear (a curved graph), so a thermocouple must be calibrated.
Define absolute zero.
Absolute zero (0 K) is the lowest possible temperature, at which the average kinetic energy of molecules is at its minimum.
Why is the thermodynamic (Kelvin) temperature scale described as an absolute scale?
Because it does not depend on the properties of any particular substance, unlike the Celsius scale, which is based on the properties of water.
State the equation relating a temperature in kelvin (T) to the same temperature in degrees Celsius (θ).
$T / K = θ / °C + 273.15$
How does a change in temperature of 1 K compare with a change in temperature of 1 °C?
They are equal — the divisions on the Kelvin and Celsius scales are the same size.
The Celsius scale is based on the properties of .........., with the freezing point taken as 0 °C and the boiling point as 100 °C.
The Celsius scale is based on the properties of water, with the freezing point taken as 0 °C and the boiling point as 100 °C.
True or False?
A temperature in kelvin can be negative, in the same way that a temperature in degrees Celsius can be negative.
False.
Absolute zero (0 K) is the lowest possible temperature, so a temperature in kelvin can never be negative.

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