function popcontrol() { // Set up Page Colors & Table var s1 = "" + "Controls" + "" + "" var messig = "All projects need a control. A control is a constant, something that doesn't change.
" + "Example: You want to test the strength of a reaction created when you mix two liquids. You decide to compare the temperature of the liquids before you mix them and after you mix them. This is where the control comes in. Instead of preparing two mixtures, you prepare three. One of these is the control." + "" + "" + "
Liquid 1Liquid 2control liquid
Temperature before62°62°62°
Temperature after mixing.69°63°
" + "Looking only at the left two columns, we might think that the reaction heated the liquids seven degrees. However, when we look at the control liquid's temperature, we see that it has warmed up one degree. It appears that the room temperature was higher than the liquids, warming them slightly, and making the experiment inaccurate." + "The solution is to subtract one degree from the temperature of the mixed liquids to compensate for the rise in temperature not caused by the reaction." + "
" var s3 = "
" + "
" popup = window.open("","Controls","height=460,width=400,top=50,scrollbars=no") popup.document.write(s1+messig+s3) popup.document.close() }