The standard interpretation of Hubble constant ≈70 km/s/Mpc
means that each mega-parsec of distance adds 70 km/s
to a galaxy recession velocity from us (or to a space expansion rate), but when expressing Hubble constant in SI units directly one gets about 2.27×10^(-18) Hz
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It means that, if Hubble Parameter was always constant and no other phenomenon (like inflation etc.) ever existed, galaxies would recede 2.27 x 10^-18 of the way to their current position in one second. Because the inverse is the Hubble Time (i.e. the estimate of the age of the universe based on the same assumptions).
But that’s in reality a meaningless interpretation, because neither of those assumptions is true as far as the current consensus stands.
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