Sound pressure refers to the local pressure variation from the ambient atmospheric pressure caused by a sound wave. It is measured in pascals (Pa) and represents how much the sound wave compresses and rarefies the air around it. Higher sound pressure levels indicate louder sounds, while lower levels correspond to quieter sounds. Sound pressure is a key factor in understanding acoustics, the science of sound. It helps in determining how sound travels through different environments, such as rooms or outdoor spaces. By measuring sound pressure, engineers can design better audio systems and improve sound quality in various settings.