A pH meter measures a pH or the acidity/alkalinity of substances. Most pH meters rely on a glass electrode that measures the number of hydrogen ions in the solution. Usually, pH meters need to be ...

Place the pH probe in each standard and record the output (in millivolts) for each standard. Enter the values in your calculator and determine the slope of the line. Figure 2 shows a typical plot of ...

When I started gardening, I assumed you could put seeds in dirt, add water and watch them grow into plants. That uneducated approach produced haphazard results and few vegetables. Somehow, I missed ...

David Kuchta, Ph.D. has 10 years of experience in gardening and has read widely in environmental history and the energy transition. An environmental activist since the 1970s, he is also a historian, ...

In addition to pH, ion, voltage and temperature measurement, the combined 781 pH/Ion Meter also offers an automatic stirrer control, a multi-point calibration with up to nine buffers (pH mode), a ...

The color of hydrangea flowers can change from pink to purple and blue by tweaking the soil. How do other plants react to those changes? Sydney Kozak explored just that. Her project, “Does changing ...