A dimensionless quantity
(a) never has a unit, (b) always has a unit,
(c) may have a unit, (d) does not exist.

- anonymous

- schrodinger

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- radar

I had one of those once, and it did not have a unit.

- anonymous

What was it then?

- radar

What is the unit of Pi?

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## More answers

- anonymous

No unit

- anonymous

what a unit of 25ºC

- radar

The unit is Celcius degree @myko

- radar

Can be converted to Fahrenheit units by a sharp student.

- anonymous

so the answer is (c) may have a unit. Other definition for dimensionless quantity is scalar quantity

- anonymous

Yeah But give an example
with a unit and without a unit!

- anonymous

i just did. And @radar gave with no units

- anonymous

@radar also can convert it to Fahrenheit if you whant

- anonymous

I need Examples
One is temperature with a UNiT!
So without unit?

- radar

In my humble opinion, the best answer would be "a"

- anonymous

ohh why!?

- radar

Pi has no unit, just a value and an irrational value at that.

- anonymous

I desagree:
http://en.wikipedia.org/wiki/Dimensionless_quantity

- anonymous

So why is it not unitless?

- radar

Plancks constant is just a value, no unit, it is just used to convert things that have a dimehnsion, ft, in. grams, degrees, lbs, etc. these are dimensionsal units.

- anonymous

oh yes!

- radar

Review that link provided by @rkparth5770 and make a decision.

- anonymous

What?!
i did not provide any

- radar

Thanks @rkparth5770 for providing additional info on this "dimensionless" subject.

- anonymous

Welcum @radar

- Callisto

Hmmm... in my physics book, Planck's constant is 6.626...x10^(-34) Js , which is with a unit :S

- radar

Just picked that out of the dark @Callisto, didn't realize that Plalnck's constant was in some kind of unit. Should of stuck with Pi lol.

- UnkleRhaukus

in SI units planks constant certainly does have dimensions,
, that is why Max Plank devise his own set of units that made it, along with other constants like the gravitational constant and the speed of light dimensionless.
i dont like the wording of the options,
i would phrase the answer as
" a dimensionless quantities has units that cancel out"
for example
\[\pi=\frac{C[{l}]}{d[l]}=\frac{C[\text{cm}]}{d[\text{cm}]}=\frac{C\cancel{[\text{cm}]}}{d\cancel{[\text{cm}]}}=\frac{C}{d}\]

- radar

Yes indeed Plancks constant does have units. I looked up (Google):
Planck's constant = 6.626068 × 10^-34 m^2 kg / s Thanks UnkleRhaukus for the review.

- radar

- radar

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