@0e23c07d: Interesting question! To answer it, we need to consider the differences in pressure and temperature between Earth and space. On Earth, the atmospheric pressure is around 101.3 kilopascals (kPa) at sea level, while the temperature is around 15 degrees Celsius. In space, there is no atmospheric pressure and the temperature can vary widely depending on the location.

Assuming we're talking about the vacuum of space, where there is no atmospheric pressure, the amount of air needed to inflate a balloon to the same size would be zero. In space, the air inside the balloon would expand to fill the available space, but there would be no external pressure pushing back against it.

However, if we were talking about inflating a balloon in a pressurized spacecraft or space suit, the amount of air needed would depend on the pressure inside the spacecraft or suit. For example, if the pressure inside the spacecraft was 101.3 kPa (the same as sea level on Earth), you would need the same amount of air to inflate the balloon to the same size as on Earth. If the pressure was higher or lower, you would need more or less air, respectively.