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→Improving Precision
==Key Stage 4==
{{#ev:youtube|https://www.youtube.com/watch?v=lvqu6JAbaKc}}
===Meaning===
Finding the [[density]] of [[solid]] [[object]]s.
===Experiment 1: Regular Cuboid===
====Method====
{| class="wikitable"
|-
|[[File:RequiredPracticalDensity1.png|center|400px]]
| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of the [[apparatus]] used in an [[experiment]] to find the [[density]] of a regular [[cuboid]].
|}
#Measure the [[mass]] of the [[cuboid]] using an [[Electronic Balance|electronic balance]] or [[Measuring Scale|measuring scale]].#Measure the length, width and height of the [[cuboid]] using a [[ruler]].
#Multiply the length, width and height to calculate the [[Volume (Space)|volume]].
#Use the equation <math>\rho = \frac{m}{V}</math> to calculate the [[density]] of the [[cuboid]].
====Improving [[PrecisionAccuracy]]====: Use a [[ruler]] with a higher [[resolution]].: Use an Place the [[Electronic Balance|electronic balance]] with a higher [[resolution]].: Use on a larger [[cuboid]] flat, level surface to reduce the [[uncertainty]] caused by the get an [[resolutionaccurate]] reading of the [[measuringmass]] devices.
===Experiment 1: Irregular Solid===
#Measure the [[mass]] of the [[object]] using an [[Electronic Balance|electronic balance]] or [[Measuring Scale|measuring scale]].
#Fill a [[Measuring Cylinder|measuring cylinder]] with enough [[water]] to [[submerse]] the [[object]].
#Take a [[reading]] of the [[Volume (Space)|volume]] of [[water]] in the [[Measuring Cylinder]].
#Place the [[object]] in the [[Measuring Cylinder]] and ensure it is [[submerse]]dsubmersed.
#Take a [[reading]] of the [[Volume (Space)|volume]] of [[water]] + [[object]] in the [[Measuring Cylinder]].
#Subtract the [[Volume (Space)|volume]] of [[water]] from the [[Volume (Space)|volume]] of [[water]] + [[object]] to find the [[Volume (Space)|volume]] of the [[object]].
: Ensure the [[mass]] is [[measure]]d at the start of the [[experiment]] so that the [[mass]] is [[measure]]d while the [[object]] is dry.
: Place the [[Electronic Balance|electronic balance]] on a flat, level surface to get an [[accurate]] reading of the [[mass]].
: Place the [[Measuring Cylinder|measuring cylinder]] on a flat, level surface and read it from eye level to get an [[accurate]] reading of the [[Volume (Space)|volume]] of [[water]].: Ensure no [[water]] is spilled to get an accurate measurement for the [[Volume (Space)|volume]] of the [[object]].: Ensure the [[object]] is fully submerged to get the correct value for the [[Volume (Space)|volume]] of the [[object]].
====Improving [[Precision]]====
: Use an Ensure no [[Electronic Balancewater]] is spilled from the [[Measuring Cylinder|electronic balancemeasuring cylinder]] so that all repeat readings are the same.: Measure the 'dry' [[mass]] of the [[object]] to ensure repeat readings are not affected by [[water]] with a higher permeating the [[resolutionobject]].