Describes the construction and use of homemade kaleidoscopes using film canisters and microscope slides. (JRH)

Presents a simple experiment that enables students to get a quantitative measure of the relationship between the resistance of a wire and the temperature of the wire allowing the calculation of the temperature coefficient of resistance. (JRH)

Presents a simple way to implement the thermometric property of a semiconductor diode to produce a thermometer with a nearly linear dependence upon temperature over a wide range of temperatures. (JRH)

Discusses an activity in which computers with color monitors can be used to demonstrate light blending with relative ease. (MKR)

Describes the construction of and the theory behind a balloon made of newspaper that is used in Brazilian folk parties. (JRH)

Discusses the origins of electronegativity as a qualitative concept in the period between 1809 and 1813. Outlines the contributions of Amedeo Avogadro and Jons Jakob Berzelius to the development of this concept. Contains 53 references. (JRH)

Describes a method to compare diffusion rates of selected amines to that of HCl. Provides an opportunity to introduce simple organic compounds early in the general chemistry curriculum and can be used to test Graham's Law for several different molar masses. (JRH)

Presents an analysis of the treatment of Newton's Laws and relativistic mass in the nine most popular college physics textbooks. Concludes that only two textbooks give a correct interpretation of relativistic mass and only a single text gives a correct discussion of Newton's First Law. (JRH)

Describes the working of the Adiabatic Gas Law Apparatus, a useful tool for measuring the pressure, temperature, and volume of a variety of gases undergoing compressions and expansions. Describes the adaptation of this apparatus to perform isothermal measurements and discusses the theory behind the adiabatic and isothermal processes. (JRH)

Presents a procedure to demonstrate how the speed of sound in air or within a denser gas can be calculated quickly and accurately in the laboratory. (MKR)

Presents a demonstration that uses a laptop computer as a source of polarized light to make clear the principle behind a liquid-crystal display (LCD). (JRH)

Presents calculations after discussing exponential growth that deal with the determination of the time of exhaustion at different rates of consumption. (PR)

Describes how Newton's Law of Cooling and the Method of Mixtures are used to solve the basic dilemma of whether to add the cool cream to the hot coffee or to let the black coffee cool down first and then add the cream. (ZWH)

Describes how the study of a hurricane can be used to provide integrated basic mechanics in a first-year college course in engineering mechanics. Presents models that predict wind speed given surface eye pressure and several radial dimensions of the storm and calculate total kinetic energy once the wind speed is determined. (ZWH)

Profiles Robin Carney, American Vocational Association's 1994 Outstanding New Vocational Teacher, who introduced a principles of technology course to the Central Oklahoma Area Vocational-Technical School. (JOW)