BTU

BTU is a unit that measures heat energy and it helps people size heaters, stoves, and air conditioners in a simple way.

Kilocalorie

Kilocalorie is a unit of energy mostly used for food and exercise, this guide explains what it means, its history, symbols, uses, and easy conversions.

Calorie

A calorie is a unit that shows how much energy is in food or used by your body and it helps you understand eating, exercise and health.

Joule

A joule is a unit of energy that tells us how much work is done or heat is used when something moves, heats up, or changes.

Energy

Energy is the power that makes things happen in the universe, and this guide explains its meaning, units, symbols, history, and easy conversions for students.

Pounds per Square Inch (psi)

Pounds per square inch psi is a unit that measures how strongly a force presses on a surface and is widely used for tire and fluid pressure.

Torr (torr)

Torr is a unit for measuring pressure, useful for science and vacuum systems, and this guide explains its meaning, history, symbols, uses, and easy conversions.

Standard Atmosphere (atm)

Standard atmosphere atm is a unit of pressure used to describe how strongly air or gas pushes on surfaces, based on normal air pressure at sea level.

Millibar (mbar)

A millibar is a small unit of pressure used mainly in weather and aviation to describe how heavy the air is on a surface.

Bar (bar)

Learn what the bar pressure unit means, how it compares to other pressure units, and how to convert it in simple steps.