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==Key Stage 1==
===Meaning===
[[File:Stopwatch.png|right|300px|thumb|A picture of a [[stopwatch]].]]
A '''stopwatch''' is a piece of [[equipment]] used to find out how long something takes to happen.
: Singular [[Noun]]: '''Stopwatch'''
: Plural [[Noun]]: '''Stopwatches'''
===About Stopwatch===
: A '''stopwatch''' can measure the [[time]] taken for something to happen, but it doesn't tell the [[time]] of day.
===Examples===
: A chef made sure the eggs were only boiled for 5 minutes.
: A scientist measured how long it takes to count to 100.
: A scientist wanted to see who could get to the other side of the field in the least time.
===Used in a sentence===
: A scientist used a '''stopwatch''' to time how long it took to count to 100.
: A scientist used a '''stopwatch''' to measure how long it took each person to run across the field.
==Key Stage 2==
===Meaning===
A '''stopwatch''', usually called a '''stopwatch''', is a [[Scientific Instrument|scientific instrument]] used to [[measure]] how much time it takes for something to happen.
==Key Stage 3==
===Meaning===
[[File:Stopwatch2.png|right|300px|thumb|A picture of a '''stopwatch'''.]]
A '''stopwatch''' is a [[Measuring Instrument|measuring instrument]] used to [[measure]] how much [[time]] it takes for something to happen.
===About Stopwatches===
: A '''stopwatch''' can usually give a [[time]] to an [[accuracy]] of to 10 milliseconds.
: Most '''stopwatches''' have a 'lap' function that will keep the timer going in the background while the [[time]] that the 'lap' button was pressed will stay on screen until it is pressed again.
: '''Stopwatches''' are subject to [[Human Error|human error]] because [[human]]s cannot always react instantly to an event. Any time recorded is probably longer than the real time because it took time for the [[human]] to react.