China Test No 6
China · 1967 · 3.3 megatons · thermonuclear (hydrogen bomb)
Overview
First Chinese H-bomb test.
With a yield of 3.3 megatons[1], the Test No. 6 is 220× more powerful than the Hiroshima bomb. As a thermonuclear (hydrogen bomb) weapon, it derives its energy from a fission explosion that ignites fusion fuel, releasing on average roughly equal energy from fission and fusion. [2]
Test No. 6 Blast Effects
The table below shows the calculated radius of each effect zone for an air burst at optimum height. Values are scaling laws from The Effects of Nuclear Weapons (Glasstone & Dolan, 1977) and the published effects scaling table[3, 4].
| Effect zone | Radius (air burst) |
|---|---|
| Fireball radius | 1.56 km |
| Severe blast (20 psi) | 3.55 km |
| Moderate blast (5 psi) | 9.27 km |
| Light blast (1 psi) | 25.5 km |
| 3rd-degree thermal burns | 19.0 km |
| 2nd-degree thermal burns | 23.0 km |
| 1st-degree thermal burns | 28.6 km |
All radii assume an air burst at optimum height and are 1-D ground-distance estimates from the detonation point. Real-world effects depend on terrain, weather, and building construction. Casualty and fallout estimates are not shown pending a verified population and fallout model.
Run the Test No. 6 on a City
Use the interactive simulator to detonate the Test No. 6 on any city worldwide. Click any location on the map to see the fireball, blast, and thermal radii (air burst at optimum height) overlaid on real geography.
🎯 Simulate Test No. 6Related Weapons
FAQ
How big is the Test No. 6 blast radius?
In an air burst at optimum height, the Test No. 6 produces a fireball roughly 1.56 km in radius and a 5 psi moderate-blast zone of about 9.27 km — the area in which most residential buildings would collapse. The 1 psi light-damage radius extends to roughly 25.5 km, where windows shatter.
What is the yield of the Test No. 6?
The Test No. 6 has a yield of 3.3 megatons of TNT equivalent. That is 220× more powerful than the Hiroshima bomb.
Is the Test No. 6 bigger than the Hiroshima bomb?
The Hiroshima bomb (Little Boy) had a yield of approximately 15 kilotons. The Test No. 6 at 3.3 megatons is 220× more powerful than the Hiroshima bomb.[5]
What thermal burn radius does the Test No. 6 produce?
In an air burst at optimum height, thermal radiation from the Test No. 6 can cause 3rd-degree burns out to roughly 19.0 km, 2nd-degree burns to 23.0 km, and 1st-degree burns to 28.6 km.
Sources
- 1.Source: Nuclear Weapon Archive (Carey Sublette), China's Nuclear Weapons (last changed 1 May 2001) — retrieved Oct 2026
- 2.Source: US DoD & ERDA (Glasstone & Dolan), via Atomic Archive, The Effects of Nuclear Weapons, 3rd ed. (1977), Chapter 1 — retrieved Oct 2026
- 3.Source: U.S. DoD / DOE (Glasstone & Dolan, via Atomic Archive), The Effects of Nuclear Weapons, 3rd ed. (1977) §2.127 — retrieved Oct 2026
- 4.Source: Wikipedia, Effects of nuclear explosions — scaling-law table — retrieved Oct 2026
- 5.Source: US DOE / NNSA Nevada Field Office, United States Nuclear Tests, July 1945 through September 1992 (DOE/NV-209 Rev. 16, Sep 2015), NNSS publication library — retrieved Oct 2026