Which force is the least understood of the four fundamental forces at the quantum level?
Quick Answer
Gravity is the least understood at the quantum level. Physicists still do not have a complete, experimentally confirmed quantum theory of gravity.
The Full Story
While gravity is extremely well described by general relativity on large scales, it remains the most mysterious fundamental force in quantum terms. Physicists have not yet produced a fully tested theory that unifies gravity with quantum mechanics. Ideas such as string theory and loop quantum gravity attempt to address this problem, but none has been confirmed experimentally. This makes gravity both the most familiar force in daily life and the hardest to reconcile with modern particle physics. Solving it is one of the biggest open problems in science.
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