Use this site to find out what a pH meter is and how to use it in this informative and concise site.

This site explains how a digital pH meter uses an electrode to measure the pH of a solution Find out how to use this instrument in this informative site.

"A centrifuge separates a heterogeneous mixture of solid and liquid by spinning it." Use this site to find out how to correctly use a centrifuge in this informative site.

Students read about examples of symmetry and patterns in alters and the mandala.