A grain of salt.
There is no such object since a milligram is a measure of mass, not of weight. A small ant would have a mass of 1 mg.
The word milligram does not have a synonym. Milligram is a unit that is used to measure the mass of an object.
The water around floating object's is a measure of that object's "Displacement". For the object to float the weight of displacement must equal the object's weight. If the water around an object is of a greater weight than an object's displacement, then the object will sink.
A paper clip.
Weight.
A milligram is a unit of weight or mass equal to 1/1000 gram.
A milligram is a measure of mass equal to about 0.00003527 ounce.
millimeter is a unit of distance while milligram is a unit of weight
Centiliters are volume, milligram is weight. The answer would be dependent on the density of the substance.
On Earth, 1 milligram of mass weighs 0.000009807 newton (0.00003527 ounce).
A milligram (mg) is a measure of weight equal to 0.001 grams or 0.0000022046 ounces.
Milligram i a unit of mass or weight like kilograms, grams, kilojoules...