![]() ![]() Presenter 1: And this means our experiment is valid. This helps us ensure only one variable is changing in this experiment. ![]() We also need to seal the gap between the beaker and the mat to stop air escaping or entering. Presenter 2: That means a brand new candle each time. The control variable is the candle, so we have to use identical candles. Other variables are kept the same or controlled. Presenter 1: To make this a valid experiment, we need to make sure we only change one variable. The bigger the beaker, the more oxygen can fit in which means it'll last longer, Presenter 2: So, let's change the volume of the beaker and that is our independent variable. Presenter 1: In this experiment, we need to measure the time it takes to candle to go out. The dependent variable is what you measure afterwards. Presenter 2: The independent variable is the one you change. Presenter 1: Variables are things that you can change or measure in an experiment. Presenter 2: To investigate this, you need to think about the variables involved to obtain valid results. Presenter 1: For example, what will happen if I put a beaker on top of a candle? To do this, we are going to run through an experiment. Presenter 2: We want to understand some of the different types of variables. ![]()
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