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### Converting units

Posted: Fri Oct 11, 2019 9:31 am
If you wanted to convert, for example, 400nm to angstroms, how would you do this?
Angstroms are 10^-10m and nm are 1*10^-9m.
Would you have to convert nm to m first, or how generally would you do this?

### Re: Converting units

Posted: Fri Oct 11, 2019 9:37 am
To convert from nanometers to angstroms, you multiply by 10.

### Re: Converting units

Posted: Fri Oct 11, 2019 9:40 am
Since Angstroms are 1*10^-10m and nm are 1*10^-9m, the nm is 10 times larger than the Angstrom. To convert from nm to Angstrom, you would just multiply by 10.

### Re: Converting units

Posted: Fri Oct 11, 2019 9:42 am
since nm= 10^-9m
10^-10m =1 Angstrom

400nm(10^-9m/1nm)(1 A/10^-10m)
=4000 A

### Re: Converting units

Posted: Fri Oct 11, 2019 10:24 am
To convert length units, we could always use meter (m) as the basic reference, that is, we could convert any unit into meter (m) first. Generally, we remember the meaning of the prefix of length units by remembering that adding the prefix means meter (m) multiplied by x power to 10.
Specifically in this question, 400nm = (400nm) * (1m / 10 ^ 9nm) * (10 ^ 10 angstrom / 1m) = 4000 angstrom

### Re: Converting units

Posted: Fri Oct 11, 2019 3:53 pm
400nm (1m / 10^9nm) (1 A / 10^-10m) = 4000 A

### Re: Converting units

Posted: Fri Oct 11, 2019 3:59 pm
To convert 400 nm to Angstroms, you would first convert it to meters by multiplying it by 10^-9. This would give you the answer in meters. Now you would convert it to angstrom. You would do this by dividing by 10^-10. This would give you the answer in Angstrom which should be 4000A.

### Re: Converting units

Posted: Fri Oct 11, 2019 5:01 pm
A good tip to remember when converting units is to make sure they cancel until what you want is left. Set them up as ratios so that when you multiply terms the top and bottom cancel.

### Re: Converting units

Posted: Fri Oct 11, 2019 5:56 pm
The method that I found easier was to first change it to meters and then use the meters to Angstrom equation to change it to Angstroms.