There are 1000m in a km. Thus if we cube both numbers we get 1,000,000,000m3 in a km3. Therefore, to convert from km3 to m3 you have to multiply the number you have by 1,000,000,000.
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123 m3 is 1.23 x 10-7 km3
The volume of the cube is 2.53 m3 = 15.625 m3
A cube is L x W x H where L=W=H. A km3 has L, W and H of 1 km. Each km is 1000 meters and each meter is 100 centimeters. Therefore 1 km is 1000 x 100 cm or 100,000 cm. This is L and W and H. L x W x H = 100,000 x 100,000 x 100,000 L x W x H = 1,000,000,000,000,000 cm3 1 km3 = 1,000,000,000,000,000 cm3 1 km3 = 1 x 1015 cm3
1 m3 is equal to 1000 litres. The definition of a litre is 1 deci-metre cubed i.e. a cube with sides each of 1/10th of 1m (10cm). So you need to do to convert from m3 to litres is multiply by 1000.
m3 = cube meterYou can represent a cube meter as a 1 meter by 1 meter by 1 meter container full of water.Now imagine a tridimentional structure containing 1000 m3 of water.