Phosphorus is an essential nutrient for all aquatic plants and algae. Only a very small amount is needed, however, so an excess of phosphorus can easily occur. Excess phosphorus is usually considered to be a pollutant because it can lead to eutrophic...
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Waterways can contain microscopic pathogens with little to no obvious physical signs that they are present. Testing for pathogens can be difficult, so testing for the presence of indicator species, such as coliform bacteria, is often done instead. Co...
When water passes through or over deposits such as limestone, the levels of Ca2+, Mg2+, and HCO3– ions present in the water can greatly increase and cause the water to be classified as hard water. This term results from the fact that calcium and ma...
LabQuest Viewer is an app that displays and controls the screen of a LabQuest using an iPad. When used in conjunction with a projector, this application can be used to demonstrate the functions of LabQuest and to enhance group presentations. This app...
Vernier Video Analysis® makes studying two dimensional motion, circular motion, and multiple objects moving in two dimensions easy and accessible. Students can use their mobile devices in the laboratory or out in the field to insert a video with rec...
Does the position of your body affect your heart rate? In this experiment, you will use a Heart Rate Monitor to measure your heart rate while sitting, lying, and standing. You will then use your results to answer the questions....
Heart rates increase during exercise. The heart rates of physically fit people increase less during exercise than those of less fit people. The heart rates of physically fit people recover to their resting rates more rapidly. In this experiment, you ...
When water passes through or over mineral deposits such as limestone, the levels of certain ions present in the water increase greatly and cause the water to be classified as hard water. This term results from the fact that calcium or magnesium ions...
How fast land and water heat and cool influence our weather. In Part I of this experiment, you will heat sand and water. You will use two Temperature Probes to see which heats faster. In Part II, you will allow hot sand and hot water to cool. This t...
Color affects the absorption of radiant energy. You can use the results of this experiment to better dress for the season—to keep cooler in the summer and warmer in the winter....