Question

How do you see the world around you in a physical sense? Where do you numbers and units come into play for you on a daily ?

Answer 1

Imagine I'm buying a new front door for my house. I go to the door shop. “How big is the doorway?” they ask. “About this size” I reply, holding my arms apart about this far¹. Then I get the door home and it's too big. If I'd used a unit of measurement I could have said “77cm wide” and got the right door. “What was the temperature yesterday?” says my friend. “Quite warm” is my answer. My other friend disagrees, she thought it was chilly. So was it warm or cold? If someone used a unit of measurement they could say “25°C maximum”.And so on.Standard units play an important role in identifying the optimum check of how much quantity has been consumed in which ratio. For example a person travelling through car needs to know the miles covered so that he can have a check on the miles covered and can forecast the time in which he will covers more miles to reach to the target destination. Standard units have their usage in daily activities such as buying or selling sugar, consuming food items, consumingcalories ,covering distances, estimating the lengths for furniture for giving orders to carpenters measuring the size for designing clothes, time duration to complete a round of walk in an exercise etc.The value of standardisation is very important.What if a nurse, rather than carefully measuring a quantity of medicine before administering it to a patient, simply gave the patient an amount that"looked right"? Or what if a pilot, instead of calculating fuel, distance, and other factors carefully before taking off from the runway, merely used a "best estimate"? Obviously, in either case, disastrous results would be likely to follow. Though neither nurses or pilots are considered scientists, both use science in their professions, and those disastrous results serve to highlight the crucial matter of using standardized measurements in science.

The system of measurements is very important in everyday life. In the past, various systems of measurements were used.
For example, length was measured in units like foot, yard, chain and mile . Weight was measured in units like pound , ounce, kati, tahil.
Today, many countries in the world use the same units of measurements. We say that they use standard units. The standard units used are the S.I. units.Under this system of units, mass is measured in kilograms (kg) and length is measured in metres (m).
The use of standard units makes it easier for people from different countries to communicate with each other.
Furthermore, the use of a standard units means a measurement in that unit has the same value anywhere in the world.

THE SEVEN BASIC SI UNITS.

The SI uses seven basic units, representing length, mass, time, temperature, amount of substance, electric current, and luminous intensity.

The first four parameters are a part of everyday life, whereas the last three are of importance only to scientists.
"Amount of substance" is the number of elementary particles in matter. This is measured by the mole, a unit discussed in the essay on Mass, Density, and Volume. Luminous intensity, or the brightness of a light source, is measured in candelas, while the Si unit of electric current is the ampere.