Assume you need to know to what extent it will take you to get from your house to some other place. You ask me, and I say, "It will take 5." 5 what? 5 minutes? 5 hours? 5 days? We utilize numbers to speak to stuff on the planet. Some of the time it's simply checking, e.g., I discovered 9 mushrooms today. I discovered 18 yesterday. So now I have 9 + 18 = 27 mushrooms. Yet, some of the time we're utilizing numbers to speak to things that we measure, like separations or weights or ranges: I have a board 12 feet long. I need to cut it into pieces 3 feet long. I can cut it into (12 feet)/(3 feet for each piece) = 4 pieces. We can utilize diverse methods for measuring something, e.g., I have a board 144 inches in length. I need to cut it into pieces 3 feet long. In the event that I simply isolate 144 by 3, without focusing on units, I get an reply of 48. In any case, what does it mean? It's an indistinguishable issue from some time recently, since 144 inches is an indistinguishable thing from 12 feet! So I would do well to find a similar solution - 4 pieces, not 48. To find a similar solution, I have to change my units: I have a board 144 inches in length. I need to cut it into pieces 36 inches long. I can cut it into (144 inches)/(36 inches per piece) = 4 pieces. So units are the means by which we ensure that our figurings about the world
When we measure a given physical quantity then after measurement we give the magnitude as well as unit along with the measurement
Here number gives the magnitude of the measurement what we did and unit gives an idea what unit is for the given measurement we used
Here unit is essential while we did any measurement because unit of the measurement may be different for different group of people but the quantity is always same when we compare them along with the unit
For example we know that
here the numbers are different in two unit system but the quantity we compared is same.
so it is always essential to put units with all measurement to have complete idea of the quantity that is measured
Because there are 1609.34 meters in a mile. 1609.34÷30=53.64 but because you put one at the beginning of the mile it will stay 53 and not round up to 54
Charge is actually either excessive number or electrons or shortage of them. as you can't destroy the electron or create it - you can't destroy or create charge
