Evanescence?
rtd. It has different meanings in Britain: including: Retired. Aged 65 and no longer working. Returned. Goods etc returned. Retard. Opposite of advance, settings on a car disributor. Rotund. Round, as with Humpty Dumpty.
Boltzmanns constant
no the spring constant is not constant on moon because there is no restoring force there
No, the gas constant, or any constant, is constant meaning it doesn't change.