Meteorologists use weather balloons to carry weather instruments high into the atmosphere. When it is first released at Earth’s surface, a weather balloon typically appears underinflated. What happens to the balloon’s volume and pressure as it rises into the atmosphere? Check all that apply.

As the balloon rises, the surrounding air pressure decreases. The lower outside pressure allows the gas inside the balloon to expand, so the balloon’s volume increases; its internal pressure also decreases as it adjusts to the lower surrounding pressure. Therefore, the correct choices are “The pressure in the balloon decreases” and “The volume of the balloon increases.”

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