Can someone explain to me why this can happen?

The density of the air in the balloon is higher than that of the ambient air due to a slightly higher pressure which is necessary to counteract the elastic return force of the balloon material.

The air in the balloon is pressurized, so it's a bit denser than the air outside the balloon.

Because air has weight

The balloon can’t stay balanced on the scale after being blown up. Also, the scale you are using is not very precise given its measuring in whole grams. I simply don’t trust the results on this experiment.

The balloon just gained 3 grams of personality (and air)

The resolution of that balance is not adequate for this experiment.

You added a knot.

In Luft gibt es (Wie in Wasser) eine Auftriebs-Kraft. Je größer das Volumen, um so größer wird der Auftrieb. Die Gewichtskraft der Luft im Ballon wird also zum größten Teil durch den gestiegenen Auftrieb aufgehoben.

The adiabatic compression of the air through the hand pump raises the temperature of the air inside the balloon and so it is lighter than the air around it and it floats just so much to indicate no increase in mass of the air and balloon.

@grok explain to the supposed girl engagement farming “why this can happen?”

All matter has mass. He just added 1g of air to a 2g balloon.

Karena yang udah ditiup kan ada tekanan anginnya

Kompresed air is heavier. More molecules occupying same space.

daaaaaaaaaaaaaaaa everything has weight you just compressed air in the balloon. Have you every filled a propane bottle. Propane weighs less than free floating air.

Imagine filling it with water! That would blow your mind!

Wahh kok jadi sama ya

betaynyaa balon inii

kok bisa gitu ya

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Menarik juga ya

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Menarik juga ya ini

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angin emg gt

bisa berubah ya

Wah jadi gitu ya

ko bisa gitu ya

waw ada beratnya guys

gitu fara ngitung nya

bisa gitu yah

Keren ya kak

Jdi gitu ya