Differences between revisions 16 and 18 (spanning 2 versions)
 [:PiraScheme#Thermodynamics: Table of Thermodynamics] [:ThermalProperties: Thermodynamics (4A): Thermal Properties of Matter] [:ChangeofState: Thermodynamics (4C): Change of State] [:Demonstrations:Lecture Demonstrations]

Heat and the First Law

PIRA classification 4B

 Grayed Demos are either not available or haven't been built yet.

4B20. Convection

 PIRA # Demonstration Name Abstract 4B20.10 convection tube Heat one side of a glass tube loop filled with water and insert some food coloring. 4B20.20 two chimney convection box A candle burns under one chimney in a double chimney convection box. Smoke is used to indicate convection in the two chimney box. 4B20.25 convection chimney with vane A candle in a chimney burns as long as there is a metal vane dividing the chimney into two parts. 4B20.30 convection chimney with confetti 4B20.40 convection projection cell An electric element heats water in the bottom of a projection cell. Diagram. 4B20.41 convection box Shadow project convection in a 1 foot square box with hot and cold sinks on the sides. 4B20.42 projection cell Introduce hot water at the bottom of cold or cold water at the top of warm in a projection cell. 4B20.45 burn your hand Shadow project a Bunsen burner flame on a screen and hold your hand in the hot gas. Use a Bunsen burner, a hot pipe, dry ice, or ice water. 4B20.50 Barnard cell A thin layer of paraffin with reflective aluminum flakes is heated until Barnard cells, or convection cells form.

4B30. Conduction

 PIRA # Demonstration Name Abstract 4B30.00 Conduction 4B30.10 conduction - dropping balls 4B30.10 conduction - dropping balls Waxed balls drop off various metal rods connected to a heat source as the heat is conducted. 4B30.10 conduction of heat Waxed balls drop at different times from rods attached to a common heat source. 4B30.11 conduction - dropping balls The center of a star configuration of five different metal bars is heated to melt wax at the far ends, dropping balls. 4B30.12 conduction - melting wax 4B30.12 thermal conductivity Dip rods in wax, then watch as the wax melts off. Time Lapse. 4B30.15 melting paraffin - sliding pointer 4B30.15 sliding pointers Vertical rods of different metals are soldered onto the bottom of a vessel filled with boiling water. Pointers held by some paraffin slide down as the rods heat. Diagram. 4B30.20 painted rods 4B30.20 conduction of heat Rods of different material are coated with heat sensitive paint and attached to a common heat source. 4B30.20 painted rods Steam is passed through a manifold with heat sensitive paint coated rods of different materials. 4B30.21 conduction bars Relative conductivities of bars of metals in a common copper block are indicated by match head ignition or temperature indicating paint. 4B30.22 iron and copper strips Iron and copper strips are coated with "thermal color" and heated at one end. 4B30.25 four rods - heat conduction 4B30.25 four rods - heat conduction 4B30.30 copper and stainless tubes 4B30.30 copper and stainless tubes A contest is held between people holding copper and stainless tubes in twin acetylene torch flames. 4B30.31 poor thermal conduct. of stainless s Heat a stainless tube with a blow torch until it is white hot and hold close to the hot spot. 4B30.31 stainless rod Heat one end of a stainless steel rod white hot while holding the other end. 4B30.32 iron and aluminum rods A student holds iron and aluminum rods in a burner flame. 4B30.35 toilet seats 4B30.35 toilet seats 4B30.40 wood and metal rod Wrap a paper around a rod made of alternating sections of wood and metal and hold in a flame. 4B30.41 high conductivity of copper Hold a burning cigarette on a handkerchief placed over a coin. 4B30.42 matches on hot plates Matches are placed on plates of two different metals over burners. 4B30.50 heat propagation in a copper rod 4B30.50 heat propagation in a copper rod 4B30.50 propagation in a copper rod Solder a copper-constantan thermocouple into a copper rod and thrust the end into a flame. 4B30.51 spreading heatwave An aluminum bar has a series of small mirrors mounted on small bimetallic strips to allow projection of the curve of the temperature in the bar as it is heated. Construction details in appendix, p.1287. 4B30.52 dropping pennies Pennies attached with wax will progressively drop off a bar as a Bunsen burner heats one end. 4B30.53 liquid crystal indicator Liquid crystal indicator from Edmund Sci. was bonded to a strip and a plate of metal and the resulting color change compared well with a computer generated model. 4B30.53 temperature indicating paper A copper bar is placed on temperature indicating paper and one end is heated. 4B30.54 heat transfer A solid copper rod has holes bored to pass steam and cold water from the same end. Thermometers along the rod measure the heat transfer into the water. 4B30.56 anisotropic conduction Conductivity is greater along the grain in wood and crystals. Heat the center of a thin board covered with a layer of paraffin and watch the melting pattern. 4B30.58 thermal vs. electrical conduction A rod is fabricated with end sections of copper and a center section of constantan. Temperatures along the rod when heated differentially are compared with voltages along it while a potential is applied. 4B30.59 electrical analog of heat flow A circuit that gives the electrical analog of heat conduction. 4B30.60 heat conductivity of water Boil water in the top of a test tube while ice is held at the bottom. 4B30.61 heat conductivity of water The bulb of a hot air thermometer is placed in water and a layer of inflammable liquid is poured on top and burned. 4B30.65 heat conduction in gases Small double walled flasks are filled with ether, the jackets contain different gases. When placed in boiling water, the height of ether flames varies. 4B30.66 heat conductivity of CO2 Author tried using dry ice to cool break the bolt. Nothing happened. 4B30.71 conduction of heat in a lamp A carbon filament lamp is filled with different gases at various pressures and the brightness of the filament observed. 4B30.72 glowing tubes Filaments in Pyrex tubes containing air, flowing hydrogen, and hydrogen at reduced pressure glow with different intensities. Picture. 4B30.73 double glow tube A single length of Nichrome wire runs through two chambers allowing comparison of thermal conductivity of two gases and variation of pressure.