Boyle’s Law Relationship between Pressure and Volume in Gasses.
STP n STP means Standard Temperature and Pressure n n n It’s the usual temperature and pressure of a lab, classroom, house etc. Standard Temperature is 273 K Standard Pressure is 1 atm or 760 torr
What do “Constant” and “Initial” mean? n Constant means the same or unchanging. n Example: n The temperature is constant n n Means “The temperature is the same” Initial means starting or beginning. n Example: n Initial Temperature means ‘Starting’ temperature.
What does Inversely Proportional mean? n Inversely Proportional means as one n variable goes up, the other variable goes down. Inversely Proportional means OPPOSITE As the cost of cars goes up, the demand for cars goes down. n As the cost of iphones goes down, demand for iphones went up. n
What is Boyle’s Law? n The volume of a gas changes inversely as the pressure of the gas if the temperature remains constant. As the volume increases, pressure decreases. n As the volume decreases, pressure increases. n
Formula for Boyle’s Law P 1 V 1 = P 2 V 2
Solve For Initial Pressure (P 1) n A 5 L balloon at an unknown initial pressure expands to 6 L at 500 torr. What is the initial pressure?
Solve for Initial Volume (V 1) n A balloon is at 250 torr. The volume decreases to 35 L when the pressure is 500 torr. What was the initial volume of the balloon?
Solve for Final Pressure (P 2) n A bike tire has an initial volume of 5 L when the pressure is 150 torr. What is the final pressure if the final volume is 7. 5 L?
Solve for Final Volume (V 2) A car tire has an initial volume of 35 L and an initial pressure of 750 torr. What is the final volume when the pressure decreases to 600 torr?