Controlled variables (things we will keep the SAME): the amount of water in each cup, the starting temperature of the water, the length of time the temperature is measured, the amount of times the temperature is measured, the equipment used e.g. thermometer, the person measuring the teperature, Independent variable (ONE thing we will CHANGE): the material of the cup, Dependent variable (the ONE thing observed/measured): the temperature of the water every 5 minutes ,

Fair testing: Insulating Materials

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