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===Meaning===
[[File:Thermometer.png|right|300px|thumb|A '''thermometer''' showing the [[temperature]] of the snow was -10°C.]]
A '''thermometer''' is a [[Scientific Instrument|scientific instrument]] piece of equipment used to [[measure]] the [[temperature]] of an object.
: Singular [[Noun]]: '''Thermometer'''
: The [[temperature]] of the [[Doctor|doctor's]] patient was found using a '''thermometer'''.
: The [[Scientist|scientist's]] '''thermometer''' showed the [[temperature]] in the [[laboratory]] was 20°C.
==Key Stage 3==
===Meaning===
A [[thermometer]] is a [[Measuring Instrument|measuring instrument]] used to [[measure]] the [[temperature]] of an [[object]].
===About Thermometers===
: [[Thermometer]] usually give the [[temperature]] in [[Degrees Celsius|degrees Celsius]] (°C).
: [[Thermometer]]s are usually made of [[glass]] so caution must be taken when using them so that they do not break.
: Most thermometers have a range of [[temperature]]s they can [[measure]] and some [[temperature]]s they can't. If a [[glass]] [[thermometer]] is placed in a fire it will [[Melting|melt]], so the [[temperature]] of the fire is beyond its range.
: A '''thermometer''' can show a negative [[temperature]] because the [[Degrees Celsius|Celsius]] scale was chosen to have [[water]] [[freezing]] as 0 [[Degrees Celsius|degrees Celsius]]. So anything colder than [[freezing]] [[water]] is given a negative [[temperature]].
==Key Stage 4==
===Meaning===
A [[thermometer]] is a [[Measuring Instrument|measuring instrument]] used to [[measure]] the [[temperature]] of an [[object]].
===About Thermometers===
: [[Thermometer]]s are usually made of [[glass]] so caution must be taken when using them so that they do not break.
: Most thermometers have a [[range]] of [[temperature]]s they can [[measure]] and some [[temperature]]s they can't so the correct [[range]] should be chosen for the [[experiment]].
: A '''thermometer''' can show a negative [[temperature]] because the [[Degrees Celsius|Celsius]] scale was chosen to have [[water]] [[freezing]] as 0 [[Degrees Celsius|degrees Celsius]]. So anything colder than [[freezing]] [[water]] is given a negative [[temperature]].
: The [[resolution]] of a [[thermometer]] may be 1°C or 0.1°C given a small space between the markings or 0.5°C or 0.05°C if those markings are spaced far apart and it can be clearly seen when the [[temperature]] is half way between markings.
: To use a [[thermometer]] [[accurate]]ly:
:*It must not have any bubbles in the [[liquid]] inside. To remove the bubbles the [[thermometer]] may be shaken carefully to more the bubbles without breaking the [[thermometer]].
:*It must be [[calibrate]]d by placing it in a known [[temperature]] and checking it [[reading|reads]] the correct value for example the [[Melting Point|melting point]] or [[Boiling Point|boiling point]] of [[water]].