Changing the units does not change the significant figures.
 
But my query is when convert hour to seconds the number of significant figures change right?
 

Asked by Shazia Salim | 24th Jun, 2014, 05:52: PM

Expert Answer:

Yes the number of significant figures change when we convert hours to second.
This is because the multiplication done to change the units from hour to second is by 3600 which is not a power of 10.
When we convert metre to centimetre then multiplication is by 100 which is a power of ten, and hence does not change the significant figures.
No change in significant figures:
1 m = 100 cm : 1 significant figure
1 mm = 0.001 m : 1 significant figure
Change in significant figures:
1 hour = 3600 seconds
1 horse power = 746 watts
For all those units which while converting are not a power of 10, then the significant figures change.

Answered by Romal Bhansali | 25th Jun, 2014, 03:25: PM