That depends what aspect of the glass of water you want to measure: its height, its volume, its mass, its index of refraction, etc.
If a person wants to measure the water in a small glass, they could use a measuring cup. A person could use a measuring spoon to measure the water.
The main SI unit for volume is of course the cubic meter. If you want smaller units, you can use the cubic decimeter (= liter), or the cubic centimeter (= ml).
The unit would be a millilitre (1 ml = 1 cubic centimetre).
use milliliters.
Liter
Mililiter
Litre
litre
A meter stick would be one. A metric tape measure would be another.A measuring tape.a rulerA meter stickyou can use a metric tape or a yardstick or a metre trundle wheel and finally a metre stickA tape measure, calibrated in meters.A meterstickusually a metric measuring tape.
There are many instruments used. And it all comes down to what you want the water for. For a general estimate, a beaker can be used for larger quantities of water, but the measurements can be off. A graduated cylinder is great for measuring accurately, but generally doesn't hold as much water. Extremely accurate devices include a pipet (like a big eyedropper) or a buret. But these generally hold very very small amounts of water. If you don't know what these devices look like, you can simply Google them.
It depends on the amount of water. In the metric system, water would be measured by liters, with a prefix if needed (Kilo, Hecto, Deca, etc.)
Bottles come in many different sizes, the most common use the metric system of measurement, a typical bottle of water would be 500mls (half a litre) or larger.
Liters
Pints
its liters
metric unit
Kilometers.
That depends what aspect of the glass of water you want to measure: its height, its volume, its mass, its index of refraction, etc.
Glass of water
Kilogram
I wiil use water
1 US gallon = 3.78541178 liters. Only if you mean pure water, then 1000 litres of water weighs 1 metric tonne. 1000 litres of water are 264.172052357 gallons that weigh 1 metric tonne.
You would use a millilitre or, equivalently, a cubic centimetre. A larger unit, which could be used, is a litre.
Milliliters/mL (Metric) or Fluid Ounces/Fl Oz (Imperial)
Metres