ThinkRankTemperature and its Measurement
Temperature tells us how hot or cold something is, but our senses are not reliable instruments for comparing temperatures. Thermometers provide a standard reading when used correctly. This chapter develops safe measurement habits and distinguishes temperature from the amount of heat involved in a situation.
Learning Objectives
- •Explain why touch is not a reliable thermometer
- •Read a thermometer using a scale
- •Identify common thermometer uses
- •Follow safe practices when measuring temperature
Key Concepts
Sensation is relative
A hand can feel the same water as hot or cold depending on what it touched before; an instrument gives a more consistent comparison.
Thermometer scales
A reading is meaningful only when the scale, unit, and instrument range are understood.
Different instruments, different purposes
Clinical and laboratory thermometers are designed for different objects, ranges, and safety conditions.
Terminology
Historical Insight
Checking fever
A clinical thermometer is designed for body temperature and must be used according to safety instructions.
Quick Check
Why can touch give a misleading idea of temperature?
Why should a laboratory thermometer not be used carelessly on the body?
How to use this lesson
Read the overview first, then explain the main idea in your own words before checking the key concepts. Use the quick-check questions without looking at the answer. For examination preparation, verify dates, definitions, and syllabus requirements against your official textbook and school or examination-board guidance.