**Definitions:**

**Atomic Mass Unit** (abbreviations: **amu, or u**): also known as dalton (symbol: Da), is a standard unit of mass that used on an atomic or molecular scale (atomic mass). One unified atomic mass unit is about the mass of one nucleon (either a single proton or neutron) and equivalent to 1 g/mol.

**Metric Tonne** (abbreviations: **metric ton, or metric tons, or ton, or tons**): is a SI metric unit of mass, also known as tonne. Although, it is used principally as a unit of mass, it has acquired a number of meanings and uses over long years. It is equivalent to 1,000 kilograms (Kg), or one megagram (Mg), or approximately 2,204.6 pounds (lb), or 1.10 short tons (US), or 0.984 long tons (imperial).

## How to Convert Atomic Mass Units to Metric Tonnes

*Example: How many metric tonnes are equivalent to 4.09 atomic mass units?*

As;

1 atomic mass units = 1.66E-30 metric tonnes

4.09 atomic mass units = Y metric tonnes

Assuming Y is the answer, and by criss-cross principle;

Y equals 4.09 times 1.66E-30 over 1

(i.e.) Y = 4.09 * 1.66E-30 / 1 = 6.7894E-30 metric tonnes

Answer is: 6.7894E-30 metric tonnes are equivalent to 4.09 atomic mass units.

*Practice Question: Convert the following units into ton:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 3.7 amu

( ii ) 55.57 amu

( iii ) 93.91 amu