This document explains Boyle's law, which states that the volume of a gas varies inversely with pressure when temperature is kept constant. It provides examples of how Boyle's law applies to balloons expanding with decreasing pressure, and gas compressing into a smaller volume under increasing pressure. Mathematical and graphical representations of the inverse pressure-volume relationship are also presented.

1. BOYLE’S LAW
Presented by
Chithra V M
Physical Science
GCTE Thycaud

2. Balloons used for observing climatic changes
expands when they
rises higher up from the sea level

3. • When the air in the
bottle is sucked out, as
the pressure decreases
the balloon expands
• When air is blown into
the bottle the balloon
compresses

4. • Volume of air decreases when pressure is
applied on the piston

5. When the gas in a cylinder is transferred to a small
cylinder its
• molecules are forced to close together
• volume decreases
• pressure increases
• mass remains the same

6. In short at constant temperature
• as pressure increases volume of gas decreases
• as pressure decreases volume of gas increases

7. Boyle’s Law
• The volume of a fixed mass of gas is inversely
proportional to its pressure at constant
temperature.
Mathematical Expression
V α 1/P
V = constant * 1/P
PV = constant

8. Graphical representation
The graph of volume Vs pressure is a hyperbola

9. Examples of Boyle’s law
Spray paint
• Paint and liquefied gas are filled inside the can of
spray paint
• The boiling point of liquefied gas is lower than room
temperature
• When the nozzle goes down the propellant expands
into gas
• Product escapes out where there is less pressure

10. Syringe
• When the plunger is pulled out, volume within
the chamber increases
• Pressure decreases
• Creates vacuum inside the chamber
• The fluid available on the other side of needle
gets sucked into the chamber