Physical Quantities and Measurement — PHYSICS STD 8 — Question
ICSE BoardEnglish MediumSTD 8PHYSICSPhysical Quantities and Measurement3 Marks
Question
Describe an experiment to determine the density of a liquid.
✓
Answer
To determine the density of a liquid $D=M / V$
We need to find $(i)$ the vol. of liquid say milk, $(ii)$ mass of liquid.
EXPERIMENT:
$(i)$ To find the mass of milk:
wt. of empty $100 c . c$ beaker $= M _1 g=70 g\ ($say$)$
Fill the beaker $($half$)$ with milk and weigh again $= M _2 g=116 g\ ($say$)$
$(ii)$ To find the vol. of milk:
Transfer this milk into measuring cylinder and note volume $V=40\ c.c\ ($say$)$
$\therefore$ Density of milk $= D =\frac{M}{V}=\frac{m_2-m_1}{40\ c . c}$
$=\frac{116-70}{40}=\frac{46}{40}=\frac{4.6}{4}=1.15\ g \ cm ^{-3}$
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