Volume
In scientific notation it is: 6.9*1012 m3 It could also be expressed as 6.9 trillion m3 or 6.9 quadrillion litres
water
A measure of the length will be in linear units. So make sure that the measurement is made or expressed in metres.
You cannot convert m2 to m3 without a third measurement as a cubic measurement is width plus length pus depth.
The SI unit for volume is m3.
It is "cubic metres".
cubic metre . that is , too , the SI unit for volume . which is , m3
Measurements of volume are expressed in meters cubed
A volume would be expressed in cubic meters (m3), not in meters.
mL
They are three different units of measurement of volume in the metric system.