What is 2.5 L combined with 800 ml?

To combine 2.5 L with 800 ml, you first need to convert both measurements to the same unit. Since 1 L is equal to 1000 ml, 2.5 L is equivalent to 2500 ml. Adding 2500 ml and 800 ml gives you a total of 3300 ml. To convert this back to liters, you divide by 1000, resulting in 3.3 L when rounded to one decimal place.