High school slogan deuterium tritium

When the temperature rises, the volume of the hydrogen balloon will expand, but the mass will remain the same.

From the formula G=mg, we can see that the gravity of the balloon remains unchanged.

In addition, the density of air remains unchanged, and the volume of the hydrogen balloon expands, resulting in a larger volume of discharged air.

According to the formula F float = ρ air gv row, the buoyancy of the balloon becomes larger.

Therefore, the answer is: it hasn't changed, but it has become bigger.