A cubical vessel of side 1 m is filled completely with water. How many millilitres of water is contained in it (neglect thickness of the vessel?

The correct option is 1000000.

To find the volume of water contained in the cubical vessel in millilitres, we can follow these step-by-step calculations:

Step 1: Calculate the volume of the cubical vessel in cubic metres (m³)
The formula for the volume of a cube is given by:

$\text{Volume}={\text{side}}^3$

Given that the side of the cubical vessel is 1 m:

$\text{Volume}={\left(1\text{m}\right)}^3=1{\text{m}}^3$

Step 2: Convert the volume from cubic metres (m³) to litres (L)
We know the standard conversion factor:

$1{\text{m}}^3=1000\text{L}$

Therefore, the vessel holds 1000 litres of water.

Step 3: Convert litres (L) to millilitres (mL)
We also know that:

$1\text{L}=1000\text{mL}$

Multiplying the volume in litres by 1000 gives the volume in millilitres:

$\text{Volume in mL}=1000\times 1000\text{mL}=1000000\text{mL}$

Thus, the cubical vessel contains 1,000,000 millilitres of water.