Assertion: weapon's energy | /r/HasProperty | about half this value
Facets:
value: for a hemispherical blast
type: PURPOSE
Source sentences:
text: This does not take into account the fact that the energy should only be about half this value for a hemispherical blast, but this very simple argument did agree to within 10% with the official value of the bomb's yield in 1950, which was 20 kilotons of TNT (84 TJ)