Watt-hour (Wh)
December 10, 2025
A watt hour is a simple way to measure how much electrical energy is used or stored over time so you can compare devices and read energy bills easily.
A watt hour is a simple way to measure how much electrical energy is used or stored over time so you can compare devices and read energy bills easily.
A gigajoule is a big unit for measuring energy that helps us describe large amounts of power, heat, or fuel in an easy and clear way.
A megajoule is a unit for measuring energy that equals one million joules and helps compare things like fuel, electricity, and food energy in a clear way.
A kilojoule is a unit that measures energy and helps you understand how much power food, machines, and daily activities use.
Learn what the technical atmosphere at is, how it measures pressure, how it compares to pascal and bar, and how to convert it for science and engineering.
Inch of water is a small pressure unit that shows how strongly a short column of water pushes on a surface.
Millimeter of water is a small unit for measuring pressure, based on the pressure made by a water column that is one millimeter high.
Centimeter of water is a small pressure unit that compares pressure to the weight of a short column of water and is often used in medicine and engineering.
Inch of mercury inHg is a pressure unit that shows how hard air or gas pushes, based on how high it can hold up a column of liquid mercury.
Learn what millimeter of mercury mmHg means, how it measures pressure, and why doctors still use it for blood pressure today.