Science 8 -Alex Hsieh

Density is the mass per unit of volume which is the amount of matter in a set amount of space .
If two objects are made of the same material they should have the same density.
In Taiwan we only have 1, 5 , 10 ,and 50 NT$ coins .
However only the 1 NT$ coin is made of a different material to the others .
A stack of 5 , 10 or 50 coins would have the same density , only the one NT$coin would have a different density.