Chemistry
The error inherent to reading the level of a liquid inside a transparent, graduated container. This can be minimised by taking the reading at as close to the level of the liquid as possible, and applies to reading the level of reagent inside laboratory glassware as well as the level of mercury in a mercury thermometer. This is one of the multitude of errors that can have a bearing on the outcome of an experiment.
Photography
This is the difference between the
image seen through the
viewfinder and the image seen by the
taking lens. It is a more common occurence
compacts and
TLRs, and almost unheard of on
SLRs. In this case, Parallax error is more noticeable with
close up subjects.