Answer :
Answer:
Explanation:
It means that you can see what is happening, either by just your eyes or a tool of some kind.
For example: water freezes at 0o C
CuSO4 is white.
Answer:
Explanation:
It means that you can see what is happening, either by just your eyes or a tool of some kind.
For example: water freezes at 0o C
CuSO4 is white.