30 grams
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To float in olive oil the box needs to displace a volume of olive oil that has the same mass as the box - the less dense the oil (for example by being warmer) the more volume the box will need to displace to equal its mass. If it cannot displace a volume of olive oil that equals its mass, the box will sink. Or to put it another way, the box will float in olive oil as long as its density is less than that of the oil.
1 kg = 1000 g so a 1200 gram box of PC has a greater mass. Simple!
1 From hot to cold 2 Lunch box and the frozen juice box 3 Refrigerator or microwave
Using a scale, the box of bricks, and the object, keep putting bricks or pieces of bricks until the scales balance. Find out how many bricks you put and multiply by the mass of one brick and you got the mass of the object.
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