Silver coins are measured by weight in grams.
Newtons
A newton - or a millinewton.
A caliper is commonly used to measure the diameter of a coin, as it provides precise measurements. Alternatively, a ruler can be used for a rough measurement, but calipers offer greater accuracy. Coin measuring tools or gauges specifically designed for coins are also available for collectors and numismatists.
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.
Grams or milligrams would be appropriate units to measure the weight of a five peso coin.
Micrometer.
Yes
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.
Millimetres, as in 1.5 mm. You could use a micrometer to measure thickness of a coin.
A newton - or a millinewton.
milligrams
A caliper is commonly used to measure the diameter of a coin, as it provides precise measurements. Alternatively, a ruler can be used for a rough measurement, but calipers offer greater accuracy. Coin measuring tools or gauges specifically designed for coins are also available for collectors and numismatists.
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.