Definition of high pressure

The term "high pressure" refers to a state in which a substance is subjected to a considerably higher force per unit area than the atmospheric pressure at sea level (approximately 1 atm or 101,325 pascals). This force is often expressed in units such as bars, atmospheres, or pounds per square inch (psi). When a material is exposed to high pressure, it experiences an increase in density and volume compression, potentially leading to molecules and atoms undergoing structural changes or chemical reactions. High pressure has numerous practical applications, such as in the production of synthetic diamonds, the manufacturing of certain materials with increased strength and hardness, the study of the Earth's mantle's properties, and the optimization of various chemical processes. In summary, the phrase "high pressure" describes regions or conditions with pressures exceeding typical atmospheric pressure.