Gujarat BoardEnglish MediumSTD 9ScienceGravitation2 Marks
Question
Does density vary with temperature$?$
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Answer
Density changes with temperature because volume changes with temperature. Density is mass divided by volume.$\text{Density}=\frac{\text{mass}}{\text{volume}}$
As you heat something up, the volume usually increases because the faster moving molecules are further apart. Since volume is in the denominator, increasing the volume decreases the density. EXAMPLES: At $10^\circ C, 1000.0g$ of water have a volume of $1000.3mL.$
$\therefore\text{Density}=\frac{1000.0\text{g}}{1000.3\text{mL}}$
$=0.99970\text{g/mL}$
At $10^\circ C, 1000.0g$ of water have a volume of $1000.73mL.$
$\therefore\text{Density}=\frac{1000.0\text{g}}{1027.7\text{mL}}$
$=0.97778\text{g/mL}$
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