PA is an online buzzword. This is a popular word among American students. Refers to those who like to attend various parties and have fun all night.

Pa stands for pressure.

Pressure refers to the ratio of the magnitude of the pressure on an object to the stress area.

PA value is a standard to express the defense ability of sunscreen against ultraviolet a light; Hotel PA generally refers to the cleaning staff in the public area of the hotel, who is responsible for the hygiene and cleaning management of the hotel.