In a controlled demolition it implodes. If a terrorist blows it up it explodes.
The opposite of implode is explode.
The antonym of 'implode' is 'explode'.
Explode
implode.
CodedGoadedLoadedExplodedCorroded
Implode means to collapse inwardly, but explode means blow up, or outwards. Exactly
explode, load. see rhymes.com
To explode is to burst outward with force. The antonym of explode is the word implode, which means to burst inward
implode
As you move upward the external pressure decreases. Thus all would try to "explode" ... but your examples would probably not (they would resist the pressure drop).
It will implode, because there is no air pressure inside of the tube, yet there is 14.7 PSI of air on the outside.
The sun will eventually expand into a red giant before shedding its outer layers and forming a planetary nebula, leaving behind a cooling remnant known as a white dwarf. It will not implode or explode in the traditional sense.