Convert Cubic inch to US beer barrel
Unit definitions
Cubic inch
The cubic inch is the volume of a cube with edges exactly $1$ inch in length.
US beer barrel
The US beer barrel is defined as exactly $31$ US liquid gallons.
How to convert Cubic inch to US beer barrel
$$\text{Volume}_{\text{bbl (beer)}} = \frac{\text{Volume}_{\text{in³}}}{7161}$$
Examples
Example 1
Convert $35.0\ \text{in³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = \frac{35.0}{7161}$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.004888$$
$$\therefore \ 35.0\ \text{in³} = 0.004888 \ \text{bbl (beer)}$$
Example 2
Convert $75.0\ \text{in³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = \frac{75.0}{7161}$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.010473$$
$$\therefore \ 75.0\ \text{in³} = 0.010473 \ \text{bbl (beer)}$$
Example 3
Convert $100.0\ \text{in³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = \frac{100.0}{7161}$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.013965$$
$$\therefore \ 100.0\ \text{in³} = 0.013965 \ \text{bbl (beer)}$$
Example 4
Convert $130.0\ \text{in³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = \frac{130.0}{7161}$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.018154$$
$$\therefore \ 130.0\ \text{in³} = 0.018154 \ \text{bbl (beer)}$$
Example 5
Convert $180.0\ \text{in³}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = \frac{180.0}{7161}$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.025136$$
$$\therefore \ 180.0\ \text{in³} = 0.025136 \ \text{bbl (beer)}$$