The centimeter equals one hundredth of a meter and is the everyday metric unit for body measurements, clothing sizes and furniture. European clothing tags, height on ID documents and household rulers are all marked in cm. An A4 sheet is 21 ร 29.7 cm.
Real-world: An average adult is 160โ185 cm tall. An A4 sheet is 21 ร 29.7 cm. A standard passport photo is 3.5 ร 4.5 cm.
Read full centimeter reference โThe foot equals 30.48 centimeters exactly and is one of the oldest length units in human history. It is the international aviation standard for altitude โ commercial airliners cruise at 35,000 feet. In the US, building dimensions, human height and elevation are all expressed in feet. 1 foot = 12 inches.
Real-world: Airliners cruise at 35,000 ft (10.7 km). Mount Everest is 29,032 ft (8,849 m). A standard US ceiling is 8 ft (2.44 m).
Read full foot reference โ