- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 17 Dec 2019
Sound exposure level
Sound exposure level is the sound level at a receptor which, if maintained at a constant level for a period of one second, would have the same amount of energy as a given event (of any duration) at the same receptor.
The sound power level (Lw) of a source is a measurement of the total acoustic power it radiates. The sound power level is an intrinsic characteristic of a source (analogous to its volume or mass), which is not affected by the environment within which the source is located.
Sound pressure level is the parameter by which sound levels are measured in air. It is measured in decibels. The threshold of hearing has been set at 0dB, while the threshold of pain is approximately 120dB. Normal speech is approximately 60dB at a distance of 1 metre and a change of 3dB in a time varying sound signal is commonly regarded as being just detectable. A change of 10dB is subjectively twice, or half, as loud. (See also Equivalent continuous sound pressure level)
See also: Sound power.
 Related articles on Designing Buildings Wiki
Featured articles and news
1 minute review of CAMRA’s guide to historic drinking dens.
Their complex heritage remains largely unknown.
New editor covered facilities management, operations and construction in the US.
Exclusive log cabins on the North Antrim coastline.
Proactive forestry for strategic water management.
CIOB urges construction to share PPE with healthcare providers.
Why not write that article you've always meant to?
One of the seven man-made wonders of Arizona.
A more flexible approach is needed.
A quick step-by-step introduction to the BREEAM process.
First pioneered in the USA and then France.