![]() ![]() Carefully melt some wax from a candle, rolling the warm wax into balls of the same size – about a quarter of an inch in diameter. Get a package of plain white candles, some matches and a watch with a second hand. Go to the hardware store and buy as many different thickness’ of copper, stainless steel and aluminum bare metal wire as you can find. In this experiment we will compare the heat conductivity of three different metals. A series of experiments that includes a control is called a “controlled experiment.” ![]() Without a control you cannot be sure that changing the variable causes your observations. They can be the hardest part of a project. Dependable controls are sometimes very hard to develop. A control is a neutral “reference point” for comparison that allows you to see what changing a variable does by comparing it to not changing anything. The only difference is that no experimental variables are changed. It is a separate experiment, done exactly like the others. For an experiment to give answers you can trust, it must have a “control.” A control is an additional experimental trial or run. This list is called an experimental procedure. Make a step-by-step list of what you will do to answer each question. Design an experiment to test each hypothesis. ![]()
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