Describes acid-base titration experiments using the computer. (MKR)

Suggests an apparatus to improve the measurement of the mechanical equivalent of heat. Describes the materials needed to construct the apparatus; the methodology of an experiment to measure the heat gained by lead shot falling through a distance of 100 meters; and the calculations made to register that gain. (MDH)

Describes the construction of durable, inexpensive and large sand-hourglasses for use in controlled experiments that allow students to observe, infer, measure, record data, and predict. This hands-on activity is designed to take place over a three-day interval. Includes materials needed, techniques, procedures, follow-up activities, and resource…

Describes the history and the development of the field of superconductivity. Identifies the significant interaction of electrons to form Cooper pairs. Presents background theory, describes approaches, and discusses problems encountered in the search for better high temperature superconducting materials. Provides technological applications of…

Presents one way, using simple materials available in hardware stores, to obtain accurate measurements of gravity acceleration in student laboratories. Analyzes a time-of-flight measuring scheme and discusses the experimental arrangements to make the measurements. (MDH)

Develops the idea of fractals through a laboratory activity that calculates the fractal dimension of ordinary white bread. Extends use of the fractal dimension to compare other complex structures as other breads and sponges. (MDH)

Findings of experimental and qualitative research on construction of science knowledge by students with mild disabilities are reported. Both lines of research indicate these students are able to construct scientific knowledge using scientific methods, positive outcomes are associated with implementation of teacher effectiveness variables, and…

To identify general principles of implementing a system of evaluation, the experience of Malawi in building a national system for agriculture is described. Applying principles of both centralization and decentralization and principles of trial and error has helped translate theories of evaluation into practice in Malawi. (SLD)

Presents an experiment to investigate centripetal force and acceleration that utilizes an airplane suspended on a string from a spring balance. Investigates the possibility that lift on the wings of the airplane accounts for the differences between calculated tension and measured tension on the string. (MDH)

A phenomenological explanation of this effect is provided. Suggestions for the inclusion of pyroelectric effects into a unit on electrostatics are given. (CW)

Examines whether teachers' views about the nature of science and scientific inquiry are reflected in their choice and design of learning experiences (particularly laboratory activities) and, therefore, are significant influences on students' understanding of science. (SM)

Describes using a local college for the teaching of the recommended Advance Placement laboratories as a way to increase greatly needed course time and to increase the amount of equipment available. (PR)

Garlic is an ideal plant for the elementary classroom. It grows rapidly in water without aeration for several weeks and remains relatively free of microbial contamination. Simple experiments with garlic purchased at grocery stores can illustrate various aspects of plant growth. (PR)

Biotechnology has arrived in the supermarket in the form of genetically engineered enzymes. Presents an activity in which students explore the presence of protease enzymes in laundry detergents. (MDH)

Presents a laboratory experiment designed to help students understand the concept of diastolic blood pressure, the pressure during which the left ventricle of the heart is not contracting. Examines the effect of strenuous exercise on blood pressure. Includes materials needed, procedures, results, and discussion of the results. (MDH)