So you can place the liquid in a container with standardized markings. Volume can change based on temperature and pressure though. The SI unit of volume is the cubic meter. Other units used can be cubic centimeters, liters, etc. Often we choose the units based on the situation. To use units in an equation though, it's often better to start with SI units. You can convert between units of volume using ratios.
So the syllogism is valid. For a syllogism to be valid, the combined diagram must contain all the information asserted by the conclusion. It may contain more information, but it cannot omit anything. Now let's try a syllogism with a particular premise. Example:
It is quite simple to determine the mood and figure of a standard form categorical syllogism. Don't make it difficult. Once you have determined the mood and figure you can look at the first chart on p. 256 (unconditionally valid) to determine whether the argument is valid or not. If the argument form is in the chart, the argument is valid. If it is not in the chart, and if you can certify that the required terms of the syllogism exist, then check the second chart. If it is on this chart, the argument is valid.