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Assuming it is a rod, the difficulty lies in that it can't measure the diameter of the beaker. Unless you were to attempt to find out the Radius/Diameter, then work out the circumference from that.
It depends on the size of the beaker.
yes
A beaker is used to measure volume using water displacement.
Place it in a graduated cylinder (or any other metered container), completely submerge the object, and record the amount of water displaced. ---------------------------------------------------------------------------------------- Place an empty beaker onto a second larger catch pan. Be sure that your catch pan will hold water without leaking, and make sure it is large enough to catch ALL of the water that will spill out of the beaker. Fill a beaker until you can see the meniscus above the rim of the container. CAREFULLY lower your irregular object into the beaker with water allowing the beaker to over flow into the catch pan. Once you have your object submerged in the beaker, remove the beaker from the catch pan. Let the little bit of water adhered to the exterior of the beaker drip into the catch pan for a few seconds to make your measurement as accurate as possible. Using a graduated cylinder, measure the volume of water that has over flowed into your catch pan. The volume of this water will be very close to the volume of your irregular object.
Assuming it is a rod, the difficulty lies in that it can't measure the diameter of the beaker. Unless you were to attempt to find out the Radius/Diameter, then work out the circumference from that.
A vernier caliper
It depends on the size of the beaker.
To measure volume
I would use a ruler (metric) but careful to only measure the inside. You could also wet the beaker and place it on a piece of paper (rim down). This will leave a wet ring that you can measure. But be sure only to measure the dry inner part of the ring.
There is no set diameter.
volume.
volume.
Beaker is used to measure large quantity of liquid.
Beaker's are typically graduated in mililiters, and a mililiter is a cubic centimeter. So while centimeters would seem a reasonable choice, I would instead suggest using milimeters as they are well suited for precise measurements. There are 1000 cubic milimeters in one ml anyways so the conversion is easy if you were trying to measure the beaker in mm, calculate the volume, and convert to ml.
To measure volume
yes