Physical quantity

Is strain a physical quantity?

15 Answers

1
kunl ·

why not[1]

1
Vinay Arya ·

I have read somewhere that all physical quantities have units.Is it true?

1
kunl ·

MAYBE I M NOT THE RIGHT PERSON TO ANSWER THIS ONE....I DON'T HAVE GOOD HOLD ON DEFINITION KIND OF THINGS[3][3][3][3]

SORRY...ANSWER ABOVE CAN BE WRONG[2]

11
Soham Mukherjee ·

no....not all physical units..eg:solubility,atomic mass....

11
Soham Mukherjee ·

yes,strain is...and it is a tensor...

1
Vinay Arya ·

The unit of atomic mass is gram.
The unit of solubility can be M.
So you are not correct.

1
Vinay Arya ·

Tensor quantities are out of our jee syllabus.So what has it to do with the unit.

6
AKHIL ·

yes it is a physical quantity..

1
Vinay Arya ·

Then it means that many books are wrong.Isn't it?.

1
seoni ·

STRAIN HAS UNIT N/M^2,,,

-----so sorry,,dunno wat i was thinking while writing dis,

1
Vinay Arya ·

Strain is=change in length /original length.So m m cancels out.So what's wrong with you?

39
Pritish Chakraborty ·

Stress has the unit N/m², Seoni...
Strain is a dimensionless quantity in which the units being used in the ratio do have an associated physical dimension. Even though length cancels length, strain can have a dimensionless unit, as per Wikipedia. But it IS a derived physical quantity, even if its dimension is 1.

1
seoni ·

oh sorry all, confused stress with strain...:(

11
Soham Mukherjee ·

@vinay..sorry it was 'molecular weight' or 'atomic weight'...they have no units..

1
Vinay Arya ·

Dear Soham
In physics we have learnt weight.In that the unit is mentioned to be N.So atomic mass will also have N as its unit.Ok?

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