Kilopascal (kPa)

Definition

The kilopascal (kPa) is a metric unit of pressure equal to 1,000 pascals (Pa). It is an SI unit, widely used in various fields to measure pressure, stress, and tension.

History

The pascal was named after Blaise Pascal and was introduced in 1971 by the International System of Units (SI). The kilopascal became widely adopted as a practical unit for expressing pressures seen in everyday applications.

Uses

Kilopascals are commonly used in meteorology to report atmospheric pressure, in engineering for material stress testing, and in various industrial applications. For example, tire pressure is often measured in kPa. Many countries, particularly those using the metric system, prefer kPa over psi (pounds per square inch).

Conversions

• 1 kPa = 0.145 psi (pounds per square inch)
• 1 kPa = 7.50062 mmHg (millimeters of mercury)
• 1 kPa = 1000 hPa (hectopascals, commonly used in weather reports)
• 1 kPa = 0.01 bar (another pressure unit)

Fun Facts

• A common misconception is that atmospheric pressure is 1013 kPa; it is actually 101.3 kPa.
• The kPa is often used in food packaging to indicate the vacuum level inside the packaging.