Water is one of the most abundant resources on Earth and the study of its phase changes holds many practical implications to both science and technology. In the past, several investigations have researched aspects of the solidification process that occurs when water freezes to ice. One of these facets is its associated linear growth velocity. Traditionally, this has been measured either through free growth or capillary tube techniques. The current study uses a methodology where measuring this velocity is accomplished through the use of infrared imaging. A conventional velocity vs. sub-cooling plot was generated and the data was fitted to a modified Noyes and Whitney growth model. Furthermore, with the use of the thermal images, a novel model was developed to calculate the percentage of water that was frozen after the initial growth step. From this, a conversion vs. sub-cooling plot was produced and the results showed that for the primary growth step, less ice forms under higher sub-coolings. (C) 2014 Elsevier Ltd. All rights reserved.