what does temperature measure

Temperature measures how hot or cold something is by telling us how much thermal energy the particles of a substance have on average.

Core idea in simple terms

• Temperature is a measure of the degree of hotness or coldness of a body or environment.

• On the microscopic level, it reflects the average kinetic energy (how fast they are moving and vibrating) of the particles in a substance.

• Higher temperature ⇒ particles jostle around faster; lower temperature ⇒ they move more slowly.

A quick image: imagine a crowded room. If everyone is strolling slowly, the “temperature” is low; if everyone is sprinting and bumping into each other, the “temperature” is high.

What temperature is not

• It is not the total heat energy in an object; a big iceberg can contain more total heat than a small cup of hot tea even though the tea has a higher temperature.

• It is not just “how hot it feels” to you, because human skin is a poor instrument and can be tricked (e.g., touching metal vs wood at the same temperature).

How we measure temperature

• We use devices like thermometers (clinical, digital, laboratory), thermocouples, and data loggers to measure temperature.

• Common scales :
  • Celsius (°C): based historically on water freezing at 0 °C and boiling at 100 °C at standard pressure.

* Fahrenheit (°F): another scale used in everyday life in a few countries.

* Kelvin (K): the SI unit; starts at absolute zero, where particle motion is at a minimum.

In physics language, a thermometer is really a tool that responds to changes in the average kinetic energy of particles and converts that into a readable number on one of these scales.

TL;DR: Temperature measures how hot or cold something is by indicating the average kinetic energy of the particles in a substance, not the total heat, and we read it using calibrated scales like Celsius, Fahrenheit, or Kelvin.

Information gathered from public forums or data available on the internet and portrayed here.