2. A helium air balloon has a volume of 20 L when it's released from sea level where the pressure is 200 kPa. What will be the hot air balloon's volume when it reaches an altitude
where the pressure is 230 kPa? Write the formula first then show your math!
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Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative