psi

A noun that can refer to a unit of pressure (pounds per square inch) or the 23rd letter of the Greek alphabet.

• 🇨🇳名词，可指压力单位磅力每平方英寸（psi），也可指希腊字母表的第23个字母（Ψ，ψ）。

1. Unit of pressure B2 formal

   A unit of pressure equal to one pound of force per square inch.

   • The tire pressure should be 32 psi.
   • The compressor can deliver up to 150 psi.
   • Check the psi rating before using the air pump.

   🇨🇳磅力每平方英寸

2. Greek letter B2 formal

   The 23rd letter of the Greek alphabet, often used in mathematics and science.

   • The symbol psi is used in quantum mechanics.
   • Psi is the 23rd letter of the Greek alphabet.
   • In psychology, psi is sometimes used to denote psychic phenomena.

   🇨🇳普西

• psis plural form
• psis' possessive plural form
• psi's possessive singular form