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 Post subject: 1 mm = 5/127 inch ≈ 0.03937 inch
PostPosted: Sun 25 Mar 2018 8:38 pm 
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1 mm = 5/127 inch ≈ 0.03937 inch

ตั้งแต่ปี 1983 ได้กำหนดให้ความยาว 1 เมตร มีค่าเท่ากับ ระยะทางที่แสงเดินทางในสูญญากาศ 1/299792458 วินาที


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