# Sectional Density Calculator, Formula, Sectional Density Calculation

### Sectional Density Calculator:

Enter the values of mass, M(g) and cross-sectional area, A(cm2) to determine the value of Sectional density, SD(g/cm2).

 Enter Mass: g Enter Cross-Sectional Area: cm2 Result – Sectional Density: g/cm2

### Sectional Density Formula:

Sectional density (SD) is a measure of a projectile’s mass relative to its cross-sectional area, typically used in ballistics.

It provides insight into how well a projectile can penetrate a target, with a higher sectional density indicating better penetration capability.

A heavier section (more mass) will have a higher sectional density (SD) if its length remains constant.

A section with a larger cross-sectional area (A) will have a lower sectional density (SD) for the same mass (M).

It helps analyze weight distribution and optimize material usage in linear structures.

Sectional density, SD(g/cm2) in grams per centimetre square is calculated by dividing the mass, M(g) in grams of the projectile by its cross-sectional area, A(cm2) in square centimetre.

Sectional density, SD(g/cm2) = M(g) / A(cm2)

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SD(g/cm2) = sectional density in grams per square centimetre, g/cm2.

M(g) = mass in grams, g.

A(cm2) = cross-sectional area in square centimetre, cm2.

### Sectional Density Calculation:

1. A bullet has a mass of 10 grams and a cross-sectional area of 0.5 cm². Calculate the sectional density.

Given: M(g) = 10g, A(cm2) = 0.5cm2.

Sectional density, SD(g/cm2) = M(g) / A(cm2)

SD(g/cm2) = 10 / 0.5

SD(g/cm2) = 20g/cm2.

1. A projectile has a sectional density of 15 g/cm² and a mass of 30 grams. Calculate the cross-sectional area.

Given: M(g) = 30g, SD(g/cm2) = 15g/cm2.

Sectional density, SD(g/cm2) = M(g) / A(cm2)

A(cm2) = M(g) / SD(g/cm2)

A(cm2) = 30 / 15

A(cm2) = 2cm2.