Returns returns the speed of sound (m/s) temperature interval 15-35 C at atmospheric pressure, maximum error 0.18 m/s Lubbers and Graaff's simplified equation a)
temperatureC in Celsius
the speed of sound (m/s)
National Physical Laboratory, 2015 Underwater Acoustics Technical Guides - Speed of Sound in Pure Water http://resource.npl.co.uk/acoustics/techguides/soundpurewater/content.html#LUBBERS
J. Lubbers and R. Graaff, 1998 A simple and accurate formula for the sound velocity in water, Ultrasound Med. Biol. Vol 24, No 7, pp 1065-1068.