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.

Speed

Speed tells us how fast something moves in a certain amount of time and helps us compare motion in daily life, science and travel.

Second

A second is the basic unit we use to measure time, like tiny steps that add up to minutes, hours and days in clocks, science and everyday life.

Square Inch (in²)

A square inch is a small unit for measuring area, equal to a square that is 1 inch long and 1 inch wide.

Square Feet (ft²)

Square feet is a unit for measuring area that tells you how much flat space something covers, like the size of a room, floor, yard, or piece of land.

Square Yard (yd²)

A square yard is a unit for measuring area on a flat surface, often used for carpets, floors and land in countries that use the yard.

Square Mile (mi²)

A square mile is a unit used to measure large areas of land, about the size of a small town, and is common in the United States and United Kingdom.

Square Nanometer (nm²)

A square nanometer is a tiny unit for measuring very small areas, used in science to describe surfaces on the scale of atoms and molecules.

Square Micrometer (µm²)

Square micrometer is a very tiny unit used to measure area on a microscopic scale, such as cells, dust, and thin layers on materials.

Square Millimeter (mm²)

A square millimeter is a very small unit for measuring area, useful when you need to measure tiny surfaces in science, engineering and everyday technical work.