# You have 30 L of a liquid. How many gallons is this?

Mar 5, 2017

$\text{1 US Gallon}$ $\equiv$ $3.785 \cdot L$

$\text{1 Imperial Gallon}$ $\equiv$ $4.546 \cdot L$

#### Explanation:

And $30 \cdot L$ $\equiv$ $\left(30 \cdot {\cancel{\text{L")/(3.785*cancel"L"*"gallon}}}^{-} 1\right)$

$\cong 8 \cdot \text{gallon}$.

The difference between US and Imperial gallons is one reason why we should adopt the metric system. One gallon will mean a different thing to me, living in Blighty, than to you, presumably living in the States. Imagine you and I were trying to trade gasoline. Would I be happy if I got less than $4 \cdot L \cdot {\text{gallon}}^{-} 1$? (Of course gasoline is commonly sold in $\text{barrels}$, and here this volume specifies $42 \cdot \text{US gallons}$.)