Liters!
In Cooking 20 milliliters or also known as 20cc's (cubic centimeters) is 2/3 of one liquid ounce. There are 30 milliliters to a liquid ounce so 20ml would be 2/3 of an ounce. I know this because I'm a nurse and this is a very common liquid measure we use in IV'S and Injections. I hoped that helped.
Since alcohol is a liquid, you would need to measure the volume of the alcohol. The unit of measure would be something like liter, millileter, fluid ounce, pint, or quart. To measure the concentration of the alcohol, read the container.
You would typically measure the weight of a pencil in grams, as ounces are not commonly used for weighing small objects like pencils.
The metric unit that would be appropriate to measure the weight of a 2-ounce letter would be grams (g). One ounce is equivalent to approximately 28.35 grams, so a 2-ounce letter would weigh about 56.7 grams.
you measure liquid or volume.
ounce
That sounds too difficult. Instead, if the item can handle being submerged in liquid, you could just measure how much liquid it displaces when submerged.
Any liquid
In metric it would be measured as fractions of a gram. In US and British weights it would be measured in terms of grains (1/7000 of an ounce) or drams (1/256 of an ounce.)
One (avoirdupois) ounce (used to measure mass) would equal 1/16 of a pound. One (troy) ounce (also used to measure mass) would equal 1/12 of a pound. (Troy ounces are usually used for precious metals today.) Fluid ounces would depend upon the specific gravity of the liquid being measured.
I would place it in a container full of liquid after measuring the liquid. I would measure the amount of liquid displaced by the object. That amount is equal to the volume of the irregular object if it is fully submerged in the liquid.
I would place it in a container full of liquid after measuring the liquid. I would measure the amount of liquid displaced by the object. That amount is equal to the volume of the irregular object if it is fully submerged in the liquid.