Tick the most appropriate answer
The gas used in filling weather ballons is

Oxygen

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helium

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nitrogen

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water vapour

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Solution

The correct option is B
helium

For two reasons, helium is used to fill weather balloons:
1. It is lighter than air, with a density of roughly one-eighth that of air, allowing it to travel upward in the atmosphere for weather forecasting.
2. Unlike hydrogen, it is inert and non-flammable, so there is no chance of explosion.
3 So, helium gas is used for filling weather observation balloons.
Hence, the correct answer is an option (B).

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