PH Balance And Your Skin The human skin's PH balance is between 4.5 and 6. PH is a chemist's term meaning "Potential of Hydrogen" and is used to measure the degree of acidity or alkalinity in the outer skin layers. 1 is the most acidic, 7 is neutral, and 14 is alkali
Light Circuits: Depending on the grade level of the students, you can have them build a very simple circuit or a very complex circuit with both series and parallel circuits combined. For my students I have them use file folders in order to design and build a series on one side, then a parallel on the other with certain parameters for the switches. The students have an amazing time and there is always 100% participation and together we saved those lights from a trip to the landfill!