Kanada's atoms and Democritus
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Kanada's Vaisheshika school taught that matter is made of indivisible particles (paramanu). Greek thinkers Leucippus and Democritus taught atoms in the 5th century BCE. Kanada's date is uncertain.
Independent discoveriesPhysics & chemistry
Indian claim
Kanada discovered the atom centuries before Democritus and 2,600 years before Dalton.
Evidence for the Indian claim
- The Vaisheshika Sutras attributed to Kanada say physical things are made of eternal, indivisible atoms of earth, water, fire and air (Britannica).
- The school also described atoms combining in pairs (dvyanuka) and triads, an early idea of compounds.
- Indian tradition places Kanada around the 6th century BCE.
Commonly credited to
Atomism began with Leucippus and Democritus in Greece; scientific atomic theory began with John Dalton (1808).
Evidence for the other claim
- Britannica dates Kanada tentatively to around the 2nd century CE; many other scholars put the school's beginnings a few centuries BCE.
- Democritus' atomism is securely dated to the 5th century BCE.
- Both were philosophical ideas; Dalton's 1808 theory was based on measured weights in chemical reactions.
What historians and scientists say
Atomism arose separately in India and Greece. Which came first cannot be settled because Kanada's date is uncertain. Neither is the same as modern atomic theory.