Is a half gallon the same as a 2 liter?

Answer 1

Not exactly but close enough for much work.

2 liters = 0.528344105 US gallons (to a ridiculous degree of accuracy! th)e last 5 is less than the volume of a single steam particle)

Answer 2

Half a gallon = 1.89270589 so it is smaller.

Answer 3

Approximately, yes.

Answer 4

half gallon = 1.89 liters