physics

How much paraffin oil would be needed to heat the same volume of water?


• Heat capacity of water = 4200 j kg-1 K-1
• Mass of 1 litre of water = 1kg
• Heat value of paraffin = 45M J kg-1
• Density of paraffin = 800kg m -3
• 1 cubic centimetre (1cm3 = 10-6 m3)
• Water Temperature of 20oC


To heat 1 litre of water from 200C to boiling point 1000C

= 80x4200 J = 336KJ

• Energy released from burning 1cm3 of paraffin

=45x800 x 10-6 MJ =36KJ

• Volume of wood needed

=336/36 = 9.33cm3

Just need this checked

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asked by Paul

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