What is basic need of si units, Chemistry

Assignment Help:

Q. What is basic need of SI Units?

Ans: The Importance of Units

Units give numbers a particular meaning. Example: I am 5 feet 10 inches tall. Feet and inches are units. I could have told you that I am five - ten. But you would only understand the information if you could figure out that I am talking about my height and that height is usually reported in the archaic English system of feet and inches. Sometimes you can get away without mentioning the units used to measure whatever you are talking about, science class is not one of those times.

2028_importance of unit.gif

Units can be most helpful when you are converting from one system of measurement to another like English to metric. If I want to convert 300 miles into kilometers,

If you look at each multiplier, you will notice that each is the same as an equation such as 1 mile = 5,280 feet, so each multiplier is the same as multiplying by 1. If you go down the equation and cancel units that appear in the numerator (top) and in the denominator (bottom) you start with 300 miles multiply by 1 five times and end up with kilometers. To find out how many kilometers there are in 300 miles, you have to do what each multiplier tells you to do. First, multiply 300 by 5,280, then multiply by 12, then multiply by 2.54, then divide by 100 and last divide by 1,000 to get 480 km.

Units can also help you catch errors when you write down and substitute numbers into equations. Be very suspicious that you may have forgotten something or inadvertently inverted something if you calculate the length of something and it comes out in sec/meter!


Related Discussions:- What is basic need of si units

Physical properties of trihydric alcohols, Physical properties of Trihydric...

Physical properties of Trihydric alcohols (a) Trihydric alcohol is an odourless, viscous, colourless and hygroscopic liquid. (b) Trihydric alcohol has high boiling point tha

Structure of organic molecules, state the purification processes commonly u...

state the purification processes commonly used by organic chemists to separate different components from a mixture

Covalent compounds are generally, Covalent compounds are generally ...... i...

Covalent compounds are generally ...... in water: (1) Soluble                                          (2) Insoluble      (3) Dissociated       (4) Hydrolysed Ans:

Expansion work, write the expression for the expansion work?

write the expression for the expansion work?

Free-radical mechanism, Free-radical mechanism: Free-radical polymerisat...

Free-radical mechanism: Free-radical polymerisation is started by organic peroxide or other reagents that decompose to give free radicals.

Define heat of combustion, The amount of heat liberated when single mole of...

The amount of heat liberated when single mole of any substance is completely burnt in oxygen is known as heat of combustion H is negative for heat of combustion.

Attaking reagent, what is attacking reagent/what its type give detail about...

what is attacking reagent/what its type give detail about this

Illustrate the physical property of matter, Q. Illustrate the physical prop...

Q. Illustrate the physical property of matter? A physical property of a substance is a quality that can be observed and measured without changing the composition of the subst

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd