Question

Why was carbon 12 chosen to calculate atomic mass units?

Answer 1

At first, oxygen was chosen and the rest elements mass were determined by oxygen. but most of the elements mass were coming in decimals.

then carbon12 was chosen. then it was observed that most of the mass of other elements are coming in whole numbers(like 20,23etc). this is the reason.

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Answer 2

Explanation:

While defining the unit for heat, the temperature range between 14°C to 15.5°C is chosen.

If we take different temperature

range than 14°C to 15.5°C, the

amount of heat required will be

slightly different. It is, therefore, essential to define a specific temperature range while.

defining the unit of heat.

.