The English made up the ounce and pound a long time ago, and finally standardized it to what it is today.
I believe the French developed the metric system with all types of measures based on the meter. a meter is about as high as a door handle, so about the same as a yard.
They divided the meter into 100 equal parts. One part is a centimeter (1/100 meter)
Can you imagine a box the shape of a small cube. Each side is a centimeter wide or about the width of a large paperclip?
That box has unimaginably thin sides. Fill it with water. (that volume is called a milliliter.)
The French weighed that water and called the weight of the water that fills a cubic centimeter a gram.
1000 g= kilogram
What I did to get a sense of all of this was to start watching for the measures on things I bought. For example, read a candy bar for ounces and grams.
Or a bag of flour. Or a bottle of water or bleach.
so for liquids we can use cups/quarts/gallons or millliliters, liters
for weight we can use ounces, pounds/tons or grams, killigrams
or inches, feet, yards, miles or centimeters, meters, kilimeters
There are other prefixes used in the metric system. I've shown you the ones we see here in the US the most often.
There is a converter in SP Nutrition tracker that will change what you know you have, say ounces, over to the metric equivalent, which in this case would be grams.
| current weight: 168.0