name a physical quantity which has no units?

Question

name a physical quantity which has no units

Answer 1

Entropy, which is physically dimensionless, being only a ratio.

Answer 2

i assume you mean QUALITY since QUANTITY is a measurement of amount

none - all physical qualities can be measured ( and you supply the quality and i'll supply the units - lol )

as for the answer above all of the supplied examples can be measured as can all things EXCEPT VACUUM - the absence of all things ( so not physical ! )

gravity - units of 'G' as in 100G .001G
dark matter - MASS
super string harmonics - FREQUENCY
smell ( n/a ) detection of odor molecules by sensory apparatus ( number - mass - distribution / parts per million )

numbers ( now that one's funny ! ) defined by NUMBERS ( mathematics IS a way to measure - lol )

entropy - is a thermodynamic concept not a property ( you may as well say thought ) and not physical - but the transfer of energy ( or heat ) that characterizes the application of entropy can be measured

Answer 3

Not sure what is meant by physical 'quantity', if you mean accepted concepts without units could think of gravity, dark matter and superstring harmonics.

Answer 4

137

Answer 5

the physical quantities which do not have units are spcific gravity or relative density, reynolds number,eulers number,froude's number,mach's number,webbers number,dielectric constant.
the numbers alone are called dimensionless numbers.

Answer 6

the hyperbolic equilibrium point x=Ax

If the Matrix A has no eigenvalues with zero real parts then the equilibrium point is called 'hyperbolic.'

Answer 7

Smell.

Answer 8

plane angle= measured using radians
solid angle=measured using steradians

Answer 9

solid angle and plane angle