How many liters in a half gallon

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Please provide values below to convert liter [L, l] to gallon (US) [gal (US)], or vice versa.

Liter

Definition: A liter (symbol: L) is a unit of volume that is accepted for use with the International System of Units (SI) but is technically not an SI unit.

One liter is equal to 1 cubic decimeter (dm³), 1,000 cubic centimeters (cm³), or 1/1,000 cubic meters (m³).

History/origin: There was a point from 1901 to 1964 when a liter was defined as the volume of one kilogram of pure water under the conditions of maximum density at atmospheric pressure.

However, due to the mass-volume relationship of water being based on a number of factors that can be cumbersome to control (temperature, pressure, purity, isotopic uniformity), as well as the discovery that the prototype of the kilogram was slightly too large (making the liter equal to 1.000028 dm³ rather than 1 dm³), the definition of the liter was reverted to its previous, and current definition.

Current use: The liter is used to measure