A sample of hydrogen gas occupies a volume of 4.1 Liters
at 105 kPa of pressure. What pressure, in kPa, would the
gas exert if the volume was decreased to 2.5 Liters?

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

The answer should be vaporization