a helium balloon has a volume of 5.3l if the volume increases to 10.6l and the pressure decreases to 9.24kPa, what is the initial pressure of the balloon?

Which feature indicates that mars resides in the inner region of the solar system

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles