Convert Deciliter to US beer barrel
Unit definitions
Deciliter
$\frac{1}{10}$ of a liter is a deciliter.
US beer barrel
The US beer barrel is defined as exactly $31$ US liquid gallons.
How to convert Deciliter to US beer barrel
$$\text{Volume}_{\text{bbl (beer)}} = \text{Volume}_{\text{dl}} \cdot 0.0008521679108327368238061287793843952$$
Examples
Example 1
Convert $40.0\ \text{dl}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 40.0 \cdot 0.0008521679108327368238061287793843952$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.034087$$
$$\therefore \ 40.0\ \text{dl} = 0.034087 \ \text{bbl (beer)}$$
Example 2
Convert $90.0\ \text{dl}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 90.0 \cdot 0.0008521679108327368238061287793843952$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.076695$$
$$\therefore \ 90.0\ \text{dl} = 0.076695 \ \text{bbl (beer)}$$
Example 3
Convert $100.0\ \text{dl}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 100.0 \cdot 0.0008521679108327368238061287793843952$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.085217$$
$$\therefore \ 100.0\ \text{dl} = 0.085217 \ \text{bbl (beer)}$$
Example 4
Convert $130.0\ \text{dl}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 130.0 \cdot 0.0008521679108327368238061287793843952$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.110782$$
$$\therefore \ 130.0\ \text{dl} = 0.110782 \ \text{bbl (beer)}$$
Example 5
Convert $200.0\ \text{dl}$ to $\text{bbl (beer)}$.
$$\text{Volume}_{\text{bbl (beer)}} = 200.0 \cdot 0.0008521679108327368238061287793843952$$
$$\text{Volume}_{\text{bbl (beer)}} = 0.170434$$
$$\therefore \ 200.0\ \text{dl} = 0.170434 \ \text{bbl (beer)}$$