# Read about units of measurement | 10 Discussions | Page 1

1. ### I Redefining the unit of mass

Can you give details?
2. ### Multiplying epsilon naught by a length quantity

Homework Statement Note that this formula (##C=4 \pi \epsilon_0 R##) and the others we have derived for capacitance involve the constant multiplied by a quantity that has the dimensions of a length. Homework Equations ##\epsilon_0## has the following units in SI: $$\frac {C^2} {N \cdot m^2}$$...
3. ### I Cgs or SI in quantum field theory?

I have an acquaintance who maintains that in quantum field theory, primarily the cgs system is used. OK, I know it's not really important, but I was under the impression that everyone had switched to SI. (My book on quantum field theory has very few actual quantities with units outside of GeV...
4. ### I Why Planck's Constant Has Dimensions and a Unit?

Despite being a constant, It has both dimensions and a unit, can someone kindly explain why ?
5. ### B Understanding the Equations and Units

I have been struggling through my physics class this summer (it doesn't help that 5 months worth of material is crammed into 2 months in an online classroom). This site has helped me out a lot, but I am still stumbling through understanding when to use certain equations. When I started reading...
6. ### Dimensional analysis

this question is about dimensional analysis involving a number with units and a number with no units, if the question is already answered in another post please redirect me if not here is a simple example, for example, : say i have 2[in]-1. the 1 is dimensionless and the 2 has units of [in]...
7. ### Calculating something wrong with Poiseuille's Law

Homework Statement At resting, can you breath sufficient air through a tube of 100 cm length and 2 cm radius? normal resting respiration rate: 10 - 20 breaths per minute (3 - 6 seconds per breath) normal resting respiration volume: 0.5 L normal pressure difference in respiration = 1 mmHg =...
8. ### A strange inconsistency when calculating area with decimals

I have a question about a seemingly illogical and strange aspect of multiplication and unit conversion that I have never noticed until now. It concerns the issue of finding the area of a square/rectangle when the length and width are expressed as decimals/fractions. Ordinarily, when you find...
9. ### Can you explain this 'Theory of Everything' formula?

I recently come across with an amazing equation of Theory of Everything; I wonder if TOE has been formulated (???) I found this equation on a website, check it out http://www.preposterousuniverse.com/blog/2013/01/04/the-world-of-everyday-experience-in-one-equation/. While seeing briefly this...
10. ### Angular momentum Units . a very basic question

I have a very basic questions about units for angular momentum. The measure is in kg m^2/s Angular velocity is in radians/s and therefore radians do not appear in the units. Here is my question, can we leave this in degees/s? Sure its not used but is it wrong? If we are dealing with...