Describes an experiment using flow densimetry for determining the solution concentration in equilibrium with the excess solid solvent present. (SL)

Describes an inexpensive device for students to measure Planck's constant using the photoelectric effect. (SL)

Describes experiments simulating the mechanics of the human elbow and back. (SL)

Presents results of analyses of flat and conical depressed target surfaces used in a bouncing ball experiment. (SL)

Describes a chemistry laboratory activity for determining the best procedure for analyzing iodide in seaweed. (SL)

Describes a method of determining the molecular weight of a weak acid. (SL)

Outlines a problem concerning the computation of hydrogen spectral line wavelength in a general physics class which is appropriate for computations on calculators with 8 significant digits of accuracy. (SL)

Describes the construction of paddle boats and inquiries that can be made with the boats. (SL)

Describes an experiment for determining the blackbody radiation constant hc/k, utilize a conventionally built cavity and a single-beam, single-window Perkin-Elmer 12-C model spectrometer. (SL)

Describes a program which can be written to represent stellar motion in the galactic plane. (CP)

Reports on the increased enthusiasm of college students toward physics following the development of student-activated corridor display units. Includes a listing of displays and comments on student reactions. (CP)

This year-long science program involved fifth grade students in the investigation of a meadow pond. Two field trips to collect pond water and organisms were arranged for the beginning and conclusion of the program. Classroom activities were designed to study aquatic organisms, life cycles, populations, and ecosystems. (MA)

Describes activities by which the porosity and permeability of materials with respect to water can be measured. (CP)

This article describes how Robert LeBleu's interest in aquatic life developed and that today he owns a large hydroculture operation supplying research crayfish nationwide. Suggested laboratory experiments with crayfish are described, as well as information on additional studies, equipment needs, and tours of the hatchery. (MA)