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Read the level of the liquid at the mark on the cylinder.
I think you are talking about a graduated cylinder. When measuring liquids in a grad. cylinder you should read at the bottom of the miniscus ( the curved surface of the water or other liquid).
Of a solid, measuring the quantity of fluid displaced by the object should suffice. Of a liquid, measuring its volume with a measuring cylinder or similar. Of a gas, measuring its mass or volume under conditions of standardized temperature and pressure
A measuring cylinder
The reading is not accurate if it is not in the liquid that you are measuring. Once you take it out, the temperature will be measuring the air.
with measuring tools
You should only remember to rinse the equipment with the suitable liquid. Like burette with HCL.
A graduated cylinder would work.
I donno
If your question is why must a graduated cylinder be dry to measure something then the answer is so that it only measures the volume of what you add to it. If it is wet or otherwise dirty, the contaminants will obviously take up some space and provide a total higher volumetric measurement than should be yielded by whatever it is you are measuring.
It does not make a difference whether you use dry good measuring cups or liquid. It may be EASIER to use liquid measuring cups because you don't have to worry about the liquid overflowing and spilling as you measure, but they both are great! Also, most butter has measurements written on the wrapper.
gradulated cylinder