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Helium/hydrogen
An empty barrel that weighs 9 kilograms can be reduced to 8 kilograms by putting a hole in it. The hole has to be large enough to remove exactly 1 kilogram from the barrel.
heat
You have to add AIR.
The question doesn't make sense, 40g weighs 40g. Do you mean what does 40g equate to in an other system of measures?
Helium/hydrogen
Wait a couple of hundred years and put anti-gravity in it. Put air in it and take it on a ride on the vomit comet aircraft to have the barrel experence weightlessness. Maybe you could just take the top off and let it fill with the sorrounding air and it will weigh less while the top is off. BEST ANSWER: A HOLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11
The correct wording is "Empty vessels make the most noise". When you knock on a empty barrel, it's loud, a full barrel is quiet. SO, he who has nothing to say - says too much.
An empty barrel that weighs 9 kilograms can be reduced to 8 kilograms by putting a hole in it. The hole has to be large enough to remove exactly 1 kilogram from the barrel.
a big hole
Helium has a lower density than air, therefore replacing the air in the barrel with helium decreases the mass of the barrel system thus the weight is decreased.
Use a density factor to make a barrel to ton conversion. The ton is a metric weight and the barrel is a volume measurement.
by first weighing the tank when empty, then a 20 lb tank will weigh 20lb plus the empty weight when full. . so if the tank weighs 15 lb empty and now weighs 25 lb , then it is half full , or half empty !!!!!!!!!!!!
heat
I would add -5
The empty weight of a 26 foot Penske rental moving truck is about 9,000 to 12,500 pounds. It depends on the make of the truck. The International and Freightliner trucks of this type are about 12,400 pounds at empty weight.
You have to add AIR.