Envelope (disambiguation)

From Wikipedia, the free encyclopedia

The term envelope may refer to:

• Envelope, the paper container used to hold a letter being sent by post
• The envelope of an e-mail, which contains the information used for routing

In science:

• envelope (mathematics), a curve, surface, or higher dimensional object defined as being tangent to a given family of lines or curves (or surfaces, or higher dimensional objects, respectively).
• ADSR envelope, the variation of a sound over time, as is used in sound synthesis
• Two envelope problem, a paradox
• Viral envelope, the membranal covering surrounding the capsid of a virus
• envelope structure, the typical three-dimensional structure of the cyclopentane molecule

In applied science:

• envelope (mechanical engineering) -- a solid representing all positions that an object may occupy during its normal range of motion.
• building envelope -- the exterior layer of a building that protects it from the elements.
• envelope detector, in electronics, an envelope is a curve that bounds another curve or set of curves, as the modulation envelope of a carrier wave
• envelope (aerospace) -- the limits within which an aircraft can operate.
• envelope (lighter-than-air-craft) -- the airtight covering that holds buoyant gas, in a blimp, airship, gas balloon or hot air balloon.
• an envelope of glass separates the inner workings of incandescent or fluorescent light bulbs from their environment.

In the military:

• Double envelopment (Pincer movement).

In entertainment:

• Envelope (band) -- a pop/rock band from Denmark.
• Envelopes (band) -- an indie/pop band from Sweden and France, based in the UK.