How Chemistry Began
Two impossible dreams, an Indian thinker who saw atoms 2,500 years before Dalton, and the science that grew out of all of it.
"Chemistry is the science of molecules and their transformations. It is the science not so much of the one hundred elements but of the infinite variety of molecules that may be built from them."
— Roald Hoffmann (Nobel Prize, Chemistry, 1981)
A hundred elements. Infinite molecules. That’s the whole game.
Chemistry didn’t begin in a laboratory.
It began with two impossible dreams. The first was the Philosopher’s Stone — a fabled substance that could turn iron, copper, and lead into gold. The second was the Elixir of Life — a potion that would grant immortality. Neither dream came true. But chasing them, people across the world spent centuries melting, mixing, distilling, and burning — and accidentally invented an entire science.
This long, restless search has a name: alchemy. It thrived roughly 1300–1600 CE in Europe, after Arab scholars carried it westward. Modern chemistry — the precise, equation-driven discipline you’ll learn in this chapter — only took shape in the 18th century. Compared with physics or mathematics, chemistry is a young science.
But its roots are far older — and they run deep through India.
India was doing chemistry before Europe had a word for it
The Sanskrit word for chemistry is Rasāyana — Rasāyan Shāstra — older than the European idea of the subject by thousands of years. It covered metallurgy, medicine, glass, cosmetics, and dyes — a much broader sweep than what we call chemistry today.
Excavations at Mohenjodaro and Harappa show baked bricks, gypsum cement (lime, sand, and traces of ), and glazed pottery — mass chemistry, practised at scale, more than 4,000 years ago. The Charaka Samhita describes the preparation of sulphuric acid, nitric acid, and oxides of copper, tin, and zinc. The black-polished ware of northern India — with its strange golden gloss — has still not been chemically replicated.
By any modern definition, this was already chemistry.
Walk into the Qutub Minar complex in Delhi today and you can stand in front of a piece of working chemistry from the year 402 CE.
The Iron Pillar of Delhi is a 7.2-metre, 6-tonne wrought-iron column raised during the Gupta dynasty. It carries an inscription honouring King Chandragupta II (Vikramaditya). For 1,600+ years, exposed to Delhi’s monsoon humidity and summer sun, it has stood with almost no rust.
How? In 2002, Prof. R. Balasubramaniam at IIT Kanpur analysed the surface and found a thin, dense protective layer of misawite ( — iron oxyhydroxide) only about 100 microns thick (one-tenth of a millimetre).
The reason this layer forms: the pillar’s iron contains an unusually high phosphorus content of about 1%. Modern industrial steel has roughly 0.05% — twenty times less. The phosphorus, combined with Delhi’s wet-dry seasonal cycle, slowly precipitates that protective film, which then blocks any further oxidation underneath.
In other words: Indian metallurgists in 400 CE were doing alloy-engineered corrosion protection that the rest of the world only understood in the 2000s.
Kanada saw atoms 2,500 years before Dalton
Around 600 BCE, an Indian thinker named Acharya Kanada (originally Kashyap) wrote one of the most extraordinary things in early science. In a text called the Vaiśeṣika Sūtras, he argued that all matter is built from invisible, indivisible particles he called paramāṇu — “the smallest possible thing.”
His description is uncannily modern. Paramāṇu, he wrote, are eternal, indestructible, spherical, and in motion. They cannot be sensed by any human organ. There are different kinds of them — as different as the substances they make. And they combine in pairs and triplets, drawn together by unseen forces.
John Dalton arrived at essentially the same picture in 1808 — 2,500 years later — and his version became the foundation of modern atomic theory. Kanada had no balance, no microscope, no spectrometer. He reasoned his way to the atom.
That same atom is what the rest of this chapter is built around.
What chemistry is, now.
Chemistry today is what Hoffmann said it was: the science of molecules and their transformations. The world around you (water in your glass, the air in your lungs, the curd that formed from milk last night, the rust on an old gate) is matter built from a hundred-odd elements, arranged into an infinite variety of molecules.
And here is the strange thing the rest of this chapter will teach you: you cannot see a single atom. You cannot weigh a single molecule on any scale that exists. Yet by the end of this unit, you’ll be able to count how many of them sit in a glass of water, predict how much of one substance reacts with another, and move effortlessly between the world of grams and the world of .
That’s the leap modern chemistry made. It’s the leap you’re about to make.
Q1.Acharya Kanada called the smallest, indivisible particle of matter by what name?
"Chemistry is the science of molecules and their transformations. It is the science not so much of the one hundred elements but of the infinite variety of molecules that may be built from them."
— Roald Hoffmann (Nobel Prize, Chemistry, 1981)
A hundred elements. Infinite molecules. That’s the whole game.
Chemistry didn’t begin in a laboratory.
It began with two impossible dreams. The first was the Philosopher’s Stone — a fabled substance that could turn iron, copper, and lead into gold. The second was the Elixir of Life — a potion that would grant immortality. Neither dream came true. But chasing them, people across the world spent centuries melting, mixing, distilling, and burning — and accidentally invented an entire science.
This long, restless search has a name: alchemy. It thrived roughly 1300–1600 CE in Europe, after Arab scholars carried it westward. Modern chemistry — the precise, equation-driven discipline you’ll learn in this chapter — only took shape in the 18th century. Compared with physics or mathematics, chemistry is a young science.
But its roots are far older — and they run deep through India.
India was doing chemistry before Europe had a word for it
The Sanskrit word for chemistry is Rasāyana — Rasāyan Shāstra — older than the European idea of the subject by thousands of years. It covered metallurgy, medicine, glass, cosmetics, and dyes — a much broader sweep than what we call chemistry today.
Excavations at Mohenjodaro and Harappa show baked bricks, gypsum cement (lime, sand, and traces of ), and glazed pottery — mass chemistry, practised at scale, more than 4,000 years ago. The Charaka Samhita describes the preparation of sulphuric acid, nitric acid, and oxides of copper, tin, and zinc. The black-polished ware of northern India — with its strange golden gloss — has still not been chemically replicated.
By any modern definition, this was already chemistry.
Walk into the Qutub Minar complex in Delhi today and you can stand in front of a piece of working chemistry from the year 402 CE.
The Iron Pillar of Delhi is a 7.2-metre, 6-tonne wrought-iron column raised during the Gupta dynasty. It carries an inscription honouring King Chandragupta II (Vikramaditya). For 1,600+ years, exposed to Delhi’s monsoon humidity and summer sun, it has stood with almost no rust.
How? In 2002, Prof. R. Balasubramaniam at IIT Kanpur analysed the surface and found a thin, dense protective layer of misawite ( — iron oxyhydroxide) only about 100 microns thick (one-tenth of a millimetre).
The reason this layer forms: the pillar’s iron contains an unusually high phosphorus content of about 1%. Modern industrial steel has roughly 0.05% — twenty times less. The phosphorus, combined with Delhi’s wet-dry seasonal cycle, slowly precipitates that protective film, which then blocks any further oxidation underneath.
In other words: Indian metallurgists in 400 CE were doing alloy-engineered corrosion protection that the rest of the world only understood in the 2000s.
Kanada saw atoms 2,500 years before Dalton
Around 600 BCE, an Indian thinker named Acharya Kanada (originally Kashyap) wrote one of the most extraordinary things in early science. In a text called the Vaiśeṣika Sūtras, he argued that all matter is built from invisible, indivisible particles he called paramāṇu — “the smallest possible thing.”
His description is uncannily modern. Paramāṇu, he wrote, are eternal, indestructible, spherical, and in motion. They cannot be sensed by any human organ. There are different kinds of them — as different as the substances they make. And they combine in pairs and triplets, drawn together by unseen forces.
John Dalton arrived at essentially the same picture in 1808 — 2,500 years later — and his version became the foundation of modern atomic theory. Kanada had no balance, no microscope, no spectrometer. He reasoned his way to the atom.
That same atom is what the rest of this chapter is built around.
What chemistry is, now.
Chemistry today is what Hoffmann said it was: the science of molecules and their transformations. The world around you (water in your glass, the air in your lungs, the curd that formed from milk last night, the rust on an old gate) is matter built from a hundred-odd elements, arranged into an infinite variety of molecules.
And here is the strange thing the rest of this chapter will teach you: you cannot see a single atom. You cannot weigh a single molecule on any scale that exists. Yet by the end of this unit, you’ll be able to count how many of them sit in a glass of water, predict how much of one substance reacts with another, and move effortlessly between the world of grams and the world of .
That’s the leap modern chemistry made. It’s the leap you’re about to make.
Q1.Acharya Kanada called the smallest, indivisible particle of matter by what name?