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Investigate the effect of [[temperature]] on the [[decay]] rate of organic material.
===Method===
*[[Independent Variable]] - Temperature of organic material.*[[Dependent Variable]] - pH of milk.*[[Control Variable]]s - Volume of milk, volume of indicator solution.#Fill a 500ml beaker with 250ml of hot water which will act as a water bath.#Place 5cm<sup>3</sup> of lipase into a testube using a pipette.#Place 5cm<sup>3</sup> of milk into another test tube using a pippette with 5 drops of 'Cresol Red' solution.#Add 7cm<sup>3</sup> of sodium carbonate solution to the milk in the test tube.#Place both test tubes in the water back and a thermometer into the milk test tube.#Once the milk mixture has reached the temperature of the water bath add 1cm<sup>3</sup> of lipase to the mixture and start a timer.#Stir throughout then record the time taken for the for the solution to turn yellow.#Repeat this using different temperatures of water in the beaker.