Attenuation and speed of sound in air varies with the frequency of the sound and the air humidity.
Speed of Sound
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
Speed of sound in air at standard atmospheric pressure with temperatures ranging -40 to 1000 °C (-40 to 1500 °F) - Imperial and SI Units.
Speed of sound in some gases at zero degrees Celsius and atmospheric pressure.
Noise attenuation in rectangular straight, lined, sheet metal ducts.
Speed of sound in common fluids like water, glycerol, kerosene and more.
Chamber sound attenuation.
The transmission of outdoor sound through and around barriers - the Fresnel Number.
The propagation of outdoors sound vs. distance and attenuation.
Attenuation of sound in seawater vs. temperature and frequency.
Speed of sound in solids and metals like aluminum, brass, concrete and more.
The attenuation in a room depends on the location of the sound source and the receiver - and the room constant.
An introduction to the nature of sound with frequencies, wave-lengths and octaves.
Room size, absorption characteristics - and attenuation in direct sound fields.
Sound attenuation from main ducts to branch ducts.
Noise attenuation in duct elbows by reflected sound.
Sound transmitted through duct walls, floors and ceilings.
Sound transmission and attenuation in building elements like massive concrete walls or floors.
Calculate the speed of sound (the sonic velocity) in gases, fluids or solids.
Altitude and speed of sound, temperature and pressure.
Acoustic noise calculation procedure HVAC systems.
Speed of sound in water at temperatures ranging 32 - 212°F (0 - 100°C) - Imperial and SI units.