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Describes process of and factors influencing liquid to gas state change

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Practice Evaporation
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Everybody Can Be A Star

Everybody Can Be A Star


Credit: David Clouston
Source: https://commons.wikimedia.org/wiki/File:SMT_press_QRP.jpg
License: CC BY-NC 3.0

Note that many years ago, recording a musical performance was a complicated and expensive process. Complex sound systems were needed to capture the audio and edit it. Making of a vinyl record required a bulky and complicated system (see image above). The advent of modern computers and sound technology greatly simplify the process. The final product can be loaded onto a compact disc (CD) using a sound programalready on the computer or easily downloadable from the Internet. Then sit back and wait for fame to come knocking at your door.

New You Can Use

  • A compact disk (CD) is composed primarily of polycarbonate coated with a thin layer of a metal (usually aluminum, but it could be gold). A recording is made by forming pits in the polycarbonate that corresponds to the zeroes and ones in the binary system. The disk has a diameter of 120 mm and typically can hold 80 minutes of music.
  • Research on development of CDs and related storage media began in the 1970s. The first commercially available CD was produced in 1982. Early CDs could not be reused once data was added to the disc, but today there are a variety of systems that allow re-recording. In addition, technological advance has produced a number of video storage media (which require much larger storage capabilities that audio data).
  • The peak year for sales of CDs was 2000. Since then, major trends in music storage have moved to downloads onto computers, smartphones, and similar devices, as well as music storage on flash drives (many of which can store 65 GB and typically cost less than $75.00).
  • Watch a video dealing with the manufacture of CDs: 


Show What you Know

With the links below, learn more about CD composition and production. Then answer the following questions.

  1. When were the standards for the manufacture of CDs adopted?
  2. List the three layers of a CD.
  3. How does light affect the stability of CDs?
  4. How can scratches on the clear die of a CD disc be dealt with?

Image Attributions

  1. [1]^ Credit: David Clouston; Source: https://commons.wikimedia.org/wiki/File:SMT_press_QRP.jpg; License: CC BY-NC 3.0

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