kilograms
Kilograms if you're answering a Maths question, pounds if you're doing the shopping and you're over 40.
you can't use kilograms to measure a orange, but you can use grams.
Kilograms would be used to measure the mass of an elephant.
grams
Litres
Kilograms
It would depend on the density of the substance. Litres measure volume; kg measure weight.
Liters are a measure of volume. Kilograms are how you measure weight. You cannot express weight in liters unless you already know the weight of a liter of whatever it is. If you meant kilograms, the answer would be 8.8 pounds.
No. Kilograms are used to measure mass. Liters (and variations of liters, i.e. mL) are used to measure volume.
meters, kilograms, liters
You must first decide WHAT you want to measure about the potatoes - their diameter, circumference, mass, volume, etc. To buy or sell potatoes, the mass (commonly called "weight") is most relevant.
Kilograms if you're answering a Maths question, pounds if you're doing the shopping and you're over 40.
liters
You can't know unless you know the density of the liquid. Water, which has a density of 1 g/mL, would have a mass of 3.785 kg in 3.785 liters. Liquids that are more dense would weigh more, liquids that are less dense would weigh less.
Kilograms
water
Neither. Since they both have a weight of 1kg (kilogram) one cannot be heavier than the other.