The volume of a fixed mass of liquid can be used to measure temperature.
Why is this?
A It can be coloured.
B It expands when it is heated.
C It is a poor conductor of heat.
D It is cheap.
Answers
Answer:
it is a poor conductor of heat
Answer:
Temperature – it is the degree of coldness or hotness of a body on some chosen scale. It is measured using a thermometer. The SI unit of temperature is the Kelvin (K). Other units include degrees Celsius (0C), Fahrenheit, F. Temperature is a basic physical quantity as well as a scalar quanity.
6.2: Temperature scale
The scale of a thermometer is obtained by selecting two temperatures called fixed points; the lower fixed point and the upper fixed point. The lower fixed point is the temperature of pure melting ice. It is taken to be 00C. The upper fixed point is the temperature of steam above pure boiling water at normal atmospheric pressure. It is taken to be 1000C. The temperature of steam is used since impurities do not affect its temperature but will raise the boiling point of water. The range between these two points is then divided into equal divisions.
On the Kelvin (absolute) scale, 00C is at 273 K while 1000C is at 373 K. Hence to convert 0C to K, add 273 to the temperature in 0C.
Convert the following into Kelvin:350C b) -1110C c) -273 0CConvert the following into 0C:123 K b) 323 K
6.3: Types of thermometers
A thermometer is designed according to the purpose for which it is required. The following are some of the commonly used thermometers:
6.3.1: Liquid-in-glass thermometer
Stem
Liquid thread
Bulb
In this thermometer the liquid expands up a capillary tube when the bulb is heated. The liquid used in this thermometer should posses the following qualities for the thermometer to be effective:
Be easily visibleExpand and contract uniformlyHave a wide range of temperature i.e high boiling point and low freezing pointBe sensitive to small temperature changesShould not wet the glass