Q1
An instrument used to measure temperature is called a:
Athermometer
Bbarometer
Ccompass
Dprotractor
CBSEClass 6 (CBSE)ScienceCh 7 · Topic 2
The Thermometer
Learning about the instrument used to measure temperature accurately.
Core concept
A clinical thermometer, used to measure human body temperature, has a narrower range (typically 35°C to 42°C) since human body temperature does not vary much. A laboratory thermometer has a much wider range (often -10°C to 110°C), since it needs to measure a broader variety of substances, including hot liquids and cold environments. Careful handling of thermometers is important, especially mercury ones, since mercury is toxic if the thermometer breaks.
Exam highlight
Key diagram
- Show a labeled diagram of a thermometer with its bulb, stem and scale.
Keywords worth remembering
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Quick notes
• A thermometer accurately measures temperature using a calibrated scale.
• Liquid-in-glass thermometers work because liquids expand when heated and contract when cooled.
• Clinical thermometers have a narrow range (35°C-42°C) suited to human body temperature.
• Laboratory thermometers have a wider range (-10°C to 110°C) for varied substances.