Data collection includes mass, volume, and temperatures.
The temperature data is then verified with liquid crystals as an optical verification. The last candle is at or above the top edge of the tank. These lit candles will serve as indicators of the presence and level of carbon dioxide in the tank when the data collection begins. Once the tank is flooded with carbon dioxide, the thermal retention of air and carbon dioxide is notably different. The tank was warmed to a temperature above 25 degrees C, as verified by liquid crystals applied directly to the inside of the tank.