What is the metric system?

The metric system (International System of Units / SI) is the global standard for measurement, using units like meters, kilograms, and Celsius. It is used by 95% of the world's population and is the official system in all countries except the US, Myanmar, and Liberia.

What is the difference between mass and weight?

Mass is the amount of matter in an object (measured in kg or lb) and stays constant. Weight is the force of gravity on that mass and varies by location (e.g., you weigh less on the Moon). In everyday use, the terms are used interchangeably.

Why does the US use imperial units instead of metric?

The US adopted the British imperial system before metrication efforts and never fully transitioned. Most US industries (science, medicine, military) use metric, but everyday life still uses miles, pounds, and Fahrenheit.

How is temperature conversion different from other units?

Temperature conversion is not just multiplication — it also involves addition/subtraction due to different zero points. Celsius and Kelvin share the same scale size (1°C = 1K) but Kelvin starts at absolute zero (−273.15°C).

What is absolute zero in Kelvin?

Absolute zero (0 K = −273.15°C = −459.67°F) is the theoretical lowest possible temperature, where particles have minimum thermal energy. It is the basis of the Kelvin scale used in science.

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International System of Units — Wikipedia

The global metric system — units, history, and usage

Imperial Units — Wikipedia

The British imperial measurement system used in the US

Temperature Conversion — Wikipedia

How Celsius, Fahrenheit, and Kelvin scales relate to each other

Measurement — Wikipedia

The science of measurement and unit standards

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