# Tag Info

1 vote

### What is the key difference between SI and MKS units?

The history section of the SI page on Wikipedia covers the history quite well. Basically, MKS came before SI. It was later upgraded to include electromagnetic units, creating a new system called ...
• 49.7k

### What is the key difference between SI and MKS units?

The main difference is the standards. MKS is/was based on the traditional standards, e.g. a kg was the mass of one liter of water at a specified temperature, a meter was 1/10,000 the equator-to-pole ...
• 34.3k

• 55.5k

### How were angles measured in ancient times?

the 360-degree circle has its origins in Babylonian astronomy combined with the need for a consistent bureaucratic calendar in the Babylonian state. As a bonus, it has factors of 2, 3, and 5, yielding ...
• 93.9k
Accepted

### Convert Coulomb's law in CGS units to SI units

Coulomb's law gives the force between two charges. This force is proportional to each of the two charges, and inversely proportional to the square of the distance between them. So, we will have some ...
• 2,133
Accepted

### Why can't we have accelaration in the form of meters per minutes*seconds?

There is nothing inherently wrong with this, it's fine to replace any unit of measurement with any other equivalent unit of measurement. 1 minute is the same thing as 60 seconds, or 1/60th of an hour -...
• 9,771
1 vote

### Why can't we have accelaration in the form of meters per minutes*seconds?

I have seen kilometers per hour per second and miles per hour per second. I haven't come across meters per minute per second before but there's nothing wrong with it. It's just that meters per ...
• 8,777
Accepted

### The Principle of Homogeneity of dimensions states that you can add,subtract quantities with same dimensions but we cannot add a constant with an angle

Dimensional homogeneity principle should be interpreted like so,- that you can't compare or equate two quantities if they have different dimensions (like distance to speed). If they have same ...
• 13.8k

### What are dimensions and how are they defined?

Dimensions of physical quantities are not related to spacetime dimensions. Dimensions of physical quantities tell us how a given quantity depends on different units of measurement. Dimensions of ...
• 21.1k
1 vote

### Dimensions of constants

Pure numbers are dimensionless, but numbers that measure things usually are not. A length can be $12$ inches or $1$ foot. Units matter here. If you say the length is $12$ or $1$, you don't know how ...
• 39.5k

### Dimensions of constants

dimension of constant such as speed of light (C)=M0L1T-1. dimension of planks constant=[ML2T-1]. dimension of number such as 1,2,3,4......etc have no dimesion

### Dimensions of constants

Take for example the gravitational constant. Expressed in SI units it is: $$G=6.674\cdot 10^{-11}\frac{\text{m}^3}{\text{kg}\cdot\text{s}^2}$$ You can also express this constant in imperial units. You ...
• 39.8k

Top 50 recent answers are included