When did the world switch to metric?

Related questions

1. How do we measure weight?
2. Does Australia use Celsius?
3. Whats a gram on a scale?
4. How many pennies does it take to weigh 100 grams?
5. Does Australia use miles or km?
6. What is the weight of a table?
7. Is Oz volume or weight?
8. How does Australia measure weight?
9. How was the weight of a gram determined?
10. How many pounds does 16 oz weigh?

Tags

1. #metric
2. #using
3. #decade
4. #during
5. #official
6. #system
7. #other
8. #first
9. #commonwealth
10. #kingdom
11. #century
12. #imperial
13. #adopted
14. #completed
15. #second
16. #countries
17. #metrication
18. #1970s
19. #united