Silver coins are measured by weight in grams.
Newtons
A newton - or a millinewton.
Coins are not cylinders. The rim of the coin is sometimes raised, as well there are depressions and peaks from the design of the coin. You should use a specific gravity test with water and a scale.
Lay a ruler across the coin and make sure it measures from one edge through the center to the other edge. Read the diameter from the ruler.
Well, honey, you grab yourself a trusty ol' caliper, the kind that can measure thickness down to the millimeter. Gently place that coin between the jaws of the caliper and give it a little squeeze to get an accurate reading. Just make sure you don't go all Hulk on it and squish the poor thing flat!
Grams or milligrams would be appropriate units to measure the weight of a five peso coin.
Yes
Micrometer.
To find out the density of a coin, you would first measure its mass using a scale, and then measure its volume using displacement method or by calculating the volume based on its dimensions. The density of the coin can be calculated by dividing the mass by the volume.
Think of the coin as a cylinder. The volume is the area of the base X the height. The area of the base is Pi X radius squared. So if you know the radius or the diameter of the coin, which you can measure, and the height which you can also measure, than PiXr2Xh will give you the volume.
Newtons
You would typically use millimeters (mm) to measure the thickness of a coin. This unit is commonly used for measuring small distances or thicknesses.
A newton - or a millinewton.
milligrams
Millimetres, as in 1.5 mm. You could use a micrometer to measure thickness of a coin.
Coins are not cylinders. The rim of the coin is sometimes raised, as well there are depressions and peaks from the design of the coin. You should use a specific gravity test with water and a scale.
Ring bottle cap coin