Per Cent Water : The water content of a cement slurry expressed as parts of water per 100 parts of dry cement by weight. Per cent usually refers to per cent by weight. If per cent by volume is meant, it should be so stated. (Bul 10C)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}