All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Jules Bruno

Boyle’s Law, also known as Mariotte’s Law or the Boyle-Mariotte Law, states that pressure and volume are inversely proportional as long as moles (n) and temperature (T) are held constant. 

Boyle’s Law 

In a closed container, pressure represents the downward force applied to it while the volume represents the free space inside of it. According to Boyle’s Law, as the pressure on a container increases then the inside volume will decrease and vice-versa. 

Boyle-Law-Compression-ExpansionInversion Relationship of Pressure & Volume

This opposing relationship can be illustrated by the following pressure-volume graph: 

Isothermal-Process-PV-plot-GraphPV Graph

The inverse relationship between pressure and volume at a constant mass for a gas at a fixed temperature is illustrated by the expression: 

Boyle-Law-ExpressionBoyle's Law Expression

Boyle’s Law Formula

The Ideal Gas Law is presented as: 

Ideal-Gas-LawIdeal Gas Law

If moles (n) and temperature (T) are held constant then the formula simplifies into: 

cconstant-Ideal-Gas-Law-ConstantIdeal Gas Law (Simplified)

In this form k represents our constant and when dealing with two sets of data for pressure and volume we obtain the Boyle’s Law Formula as: 

Boyle-Law-Formula-EquationBoyle's Law Formula

Now let’s use it in a practice problem. 


PRACTICE: A gas occupies 4.23 L at 2.25 atm. What is the volume at 3.46 atm?

STEP 1: Identify the variables given. 

Given-Variables-Boyle-LawIdentifying given variables (Boyle's Law)

STEP 2: Isolate the missing variable for the second volume (V2). 

Solving-Missing-Variable-V2Solving missing variable (V2)


Beyond Boyle’s Law

Boyle’s Law represents one of the Simple Gas Laws besides Charles Law, Avogadro’s Law and Gay-Lussac’s Law. In order to understand non-ideal gases we must examine the kinetic theory of gases and the Van der Waals equation


Jules Bruno

Jules felt a void in his life after his English degree from Duke, so he started tutoring in 2007 and got a B.S. in Chemistry from FIU. He’s exceptionally skilled at making concepts dead simple and helping students in covalent bonds of knowledge.