What is cosmic accelaration
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The accelerating expansion of the universe is the observation that the universe appears to be expanding at an increasing rate. In formal terms, this means that the cosmic scale factor a(t) has a positive second derivative,so that the velocity at which a distant galaxy is receding from the observer is continuously increasing with time.
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A pH of 7.0 is neutral. Anything above that (7–14) is basic, and anything below that (0–6) is acidic. The pH of lemon juice is about 2.0, whereas tomato juice's pH is about 4.0!
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