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100 C=centi centimeter or hundredth of a meter. 50cm is half a meter
A Kilometer is bigger than a meter
Take the density of water as 1 gram per cubic centimeter. With 1 meter = 100 cm, then a 1 meter tall column of water with cross sectional area of 1 cm2 has a volume of (1 cm2)x(100 cm) = 100 cm3. So this column of water has a mass of 100 grams. 1 kg = 1000 grams, so 100 grams = 0.1 kg. Therefore it is 0.1 kg per cm2.
It is 310.3 rounded to the nearest tenth
It is then 2461.8 when rounded to the nearest tenth