# A piece of iron weighs 44.5gf in air,39.5gf in water and 49.3gf in paraffin Calculate the density of Iron and the density of Paraffin

2
by sucharitalovesa

2015-01-13T02:24:58+05:30

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There is probably a mistake in teh given number for weight in paraffin liquid.  It is 40.3 gf rather than  49.3 gf

Relative density of  iron =  weight in air / (weight in air - weight in water)
= 44.5 gf / (44.5 - 39.5) gf = 8.9
density of iron = 8.9 * 1000 kg /cubic meter = 8900 kg/ cub meter

relative density of  paraffin
= (weight of iron piece in air - weight in paraffin) / (weight in air - weight in water)
= (44.5 - 40.3 ) / ( 44.5 - 39.5)
= 4.2 / 5 = 0.84

density of paraffin liquid =  840 kg/cubic meter

2015-01-13T08:59:57+05:30
Relative density of  iron =  weight in air / (weight in air - weight in water)
also use
relative density of  paraffin
= (weight of iron piece in air - weight in paraffin) / (weight in air - weight in water)