Answer :
Final answer:
The two common temperature scales are Celsius and Fahrenheit. A modern thermometer typically contains coloured spirit or mercury as the measuring fluid.
Explanation:
Temperature Scales
There are two primary temperature scales that are commonly used: Celsius and Fahrenheit. The Celsius scale, also known as the centigrade scale, is based on the freezing point of water at 0 degrees and the boiling point at 100 degrees under standard atmospheric conditions. The Fahrenheit scale, on the other hand, sets the freezing point of water at 32 degrees and the boiling point at 212 degrees. These differing scales are used in various regions and for different purposes: Celsius is commonly used in most countries, while Fahrenheit is primarily used in the United States.
Contents of a Modern Thermometer
The substance inside a modern thermometer is usually coloured spirit, typically pink. In addition to spirit thermometers, some thermometers contain mercury, which is a silvery liquid metal that expands and contracts with temperature changes. Although mercury thermometers have been widely used, many have shifted to spirit-based thermometers due to safety concerns, as mercury can be hazardous when broken.
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