Amedeo Avogadro

In proposing my hypothesis, I sought to bring harmony to the apparent chaos of gaseous combinations.

The relative weights of molecules can be deduced from the densities of gases.

A single experiment can sometimes overthrow the most elegant hypothesis.

The true philosopher observes facts without prejudice and reasons from them without fear.

Nature operates with an economy of means; the molecular hypothesis reflects this economy.

The concept of a mole is a bridge between the tangible and the invisible.

Chemical notation should represent the number of atoms in a molecule.

The density of a gas is a direct measure of the mass of its molecules.

I have endeavored to show that the laws of combination are logical consequences of the molecular structure of matter.

The skepticism of contemporaries is the test of a new idea.

In science, clarity of definition is as important as accuracy of experiment.

The constancy of Avogadro's number is a testament to the order underlying the material universe.

To understand a substance, one must know not only its composition but also the arrangement of its molecules.

The motion of molecules is the cause of heat and pressure.

A theory is valuable in proportion to the phenomena it can explain.

The volume of a gas is determined by the number of its molecules, not by their size.

My work was an attempt to bring quantitative rigor to the qualitative science of chemistry.

The combination of gases in simple proportions suggests a simplicity in their molecular architecture.

Truth in science is often found by considering the simplest explanation consistent with the facts.

The molecular hypothesis makes possible the calculation of atomic weights with precision.