The hydrometer measures specific gravity, which is a unit-less quantity that expresses the ratio of a liquid's density to the density of water. For example, if a liquid as an SG of 1.000, it has the same density as water. An SG of 1.100 indicates that a liquid is ten percent denser than water. One with an SG of 1.010 is just one percent denser. On some hydrometers there are other scales whose units are in degrees Brix, degrees Balling, or Plato. But those units are used specifically to measure sugar content in juices, wine, and beer. If you're curious about that, Wikipedia has a few articles to check out.
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You wold measure how tall a room is by using a meter stick or in any form of units.
You cannot. A circle is a 2-dimensional object which has an area but no thickness and, therefore, no volume. A litre is a measure of volume. You cannot measure an object with no volume using units that are intended for volume.
YES!!! For example;- A rectangle may have sides of 3 units and 5 uints. To find the area you multiply these two sides together. Hence Area = 3 units X 5 units = 15 sq. units(square units ) Note the use of the word 'square for area units. Theis method of description is used when measurements are in the Imperial System/ However when using the Metric system, , the units are described as 'Units^2'. Volume becomes 'cu.units' ( cubic units) ; Imperial and 'units^3' ( Metric)
Measure the depth and width using the same units. Divide the depth measurement by the width measurement.
Using Pythagoras' Theorem: 35.56683849 units or 36 units which is correct to 2 significant figures.