Word search #10747 - Until I am measured I am not known, Yet how ...

Until I am measured I am not known, Yet how you miss me when I have flown. What Am I? ...(solution)

FBTPULSET
IAPURYSSC
RLHRTIKRE
ECUPNNCET
MOMOIDAVI
ANOSAERIH
NYUEPMCNC
WORRAPSUR
CBEKARONA
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