What are Indian knowledge systems?
Indian knowledge systems (IKS) means the knowledge built up in India over thousands of years and passed down through texts, teachers, guilds and families. It includes theoretical knowledge (maths, logic, grammar) and practical skills (metal-working, dyeing, building, farming, medicine).
How it was passed on: oral memorisation, the guruβshishya system, universities such as Takshashila and Nalanda, and craft families and guilds. Good study of IKS asks three questions: What was known? What is the evidence? How does it connect to today? It does not claim that every modern idea was already known.
Mathematics and astronomy
- Place value with zero: ten digits whose value depends on position. Brahmagupta (628 CE) gave rules for adding, subtracting and multiplying with zero and negative numbers. The Bakhshali manuscript uses a dot for zero.
- Geometry in the Sulba Sutras for building fire altars, including a rule like the Pythagorean relation.
- Trigonometry: the sine (jya) tables of Aryabhata; the Kerala school found infinite series for sine and Ο.
- Astronomy: nakshatras, tithis and the lunisolar calendar (see the Indian astronomy lesson).
Chemistry in India: traditional chemical practices
Long before modern chemistry labs, Indian craftspeople controlled chemical changes:
- Dyeing: indigo (blue), madder and lac (red), turmeric (yellow). Mordants such as alum fix dye to cotton by linking dye and fibre, so colours do not wash out. Kalamkari and ajrakh cloth use this.
- Glass and glazes: glass beads and bangles from early times.
- Pigments: mineral and plant colours in cave paintings such as Ajanta.
- Rasashastra: medieval texts on processing metals and minerals for medicine.
- Everyday chemistry: soap-nut (reetha) as a natural detergent, lime plaster, perfume distillation (attar of Kannauj).
Metallurgy: iron, steel, zinc and bronze
- Iron pillar (Delhi): about 7 m tall, made around 400 CE. It has barely rusted. Studies show the iron has extra phosphorus and very little sulphur; a thin, tight protective layer forms on the surface and slows further rusting.
- Wootz steel: crucible steel from south India and Sri Lanka, made by heating iron with carbon in sealed clay pots. It was traded widely and used for famous patterned blades.
- Zinc distillation: zinc boils at about 907 Β°C, close to the temperature needed to free it from ore, so it escapes as vapour. At Zawar (Rajasthan), workers used clay retorts placed upside down so the vapour went down into a cooler pot and condensed to metal. This large-scale downward distillation ran centuries before it was done in Europe.
- Bronze casting: the lost-wax method (shape in wax, cover with clay, melt the wax, pour metal), used from Harappan times to Chola bronzes.
Project idea
Make a poster or model on one practice (for example, alum-mordant dyeing with turmeric on cotton). State the raw materials, the chemical change, safety, and how industry does it today.
Medicine, language and other fields
- Ayurveda: the Charaka Samhita (medicine, diet, daily routine) and the Sushruta Samhita (surgery, including early nose reconstruction and over 100 instruments). Modern use needs clinical testing.
- Yoga: physical and mental discipline, now practised worldwide.
- Language: Panini's Ashtadhyayi (around the 4th century BCE) describes Sanskrit with about 4,000 short rules, an approach later compared to computer grammars.
- Farming and water: tanks, check dams and crop rotation suited to monsoon climates.
Design ideas from Indian traditions
Traditional design solves real problems with local materials:
- Stepwells (baolis/vavs): steps going down many levels reach water as the water table rises and falls; shaded and cool. Example: Rani ki Vav (Patan) and Chand Baori (Abhaneri).
- Jaali screens: carved stone lattices let in air and soft light, give privacy and cool the air that passes through.
- Courtyard houses and wind-catchers: hot air rises out of a central court, drawing cooler air in.
- Patterns: kolam and rangoli use grids and symmetry; block prints repeat a motif.
- Everyday products: the clay pot (matka) cools water by evaporation; the charpai uses tension weaving.
A designer today can apply the same thinking: understand users and climate, use local, low-energy materials, and build to last.
Try it
Fill a clay pot and a plastic bottle with water and leave them in shade for 3 hours. Measure both temperatures. The clay pot is cooler because water seeps out and evaporates. In the 3D, pick each field on the wheel and note one example.
Key formulas and definitions
- Place value: 105 = 1Γ100 + 0Γ10 + 5Γ1
- Rust: iron + oxygen + water β hydrated iron oxide
- Zinc: boils β 907 Β°C β vapour β cooled below β solid zinc (downward distillation)
- Mordant: dye + mordant (alum) + fibre β fixed colour
- Lost-wax: wax model β clay mould β melt wax β pour metal β break mould
- Evaporative cooling: water evaporates β takes heat β pot cools
Worked examples
1. Write 4,082 in expanded place-value form and say what the zero does.
4Γ1000 + 0Γ100 + 8Γ10 + 2Γ1. The zero holds the hundreds place empty; without it the number would read 482.
2. Why is zinc hard to extract with an ordinary furnace, and how did Zawar workers solve it?
Zinc turns to vapour at about the same temperature needed to reduce its ore, so it escapes with the hot gases. They used upside-down retorts that led the vapour down into a cooled pot, where it condensed as metal.
3. Explain why the Delhi iron pillar rusts so little.
Its iron has more phosphorus and little sulphur. In the local air this helps a thin, dense protective layer form on the surface, which blocks water and oxygen from reaching fresh metal.
4. Suggest how a modern school building could use two ideas from Indian design.
Jaali screens on the sunny side to cut glare and let air through, and a central courtyard or stepped rainwater tank to cool the building and store water.
Common mistakes
- Claiming every modern invention was already known in ancient India: IKS study must rely on evidence such as texts, objects and tests.
- Thinking the iron pillar is made of stainless steel: it is wrought iron; its protection comes from its composition and a surface layer.
- Believing "zero" was just a symbol: Indian mathematicians also gave rules for calculating with zero.
- Treating traditional medicine claims as proven: they must pass modern clinical trials.