You can't directly convert milliliters (ml) to inches because they measure different things:

* Milliliters (ml) measure volume, which is the amount of space a substance occupies.

* Inches (in) measure length, which is the distance between two points.

To convert ml to inches, you would need more information, such as the shape of the container holding the 40 ml of liquid.

For example:

* If you have 40 ml of liquid in a cube, you could calculate the side length of the cube in inches.

* If you have 40 ml of liquid in a cylinder, you would need to know the radius or diameter of the base to calculate the height in inches.

Let me know if you have more details about the shape and you want to make the conversion!