PIRA 4A30.00 SOLID EXPANSION

DCS #DEMONSTRATIONREFERENCEABSTRACT
4A30.00Solid Expansion
4A30.10bimetal stripPIRA 200Strips of dissimilar metals bonded together bend when heated.
4A30.10bimetal strip4A30.10A bimetal strip of brass and steel is heated in a Bunsen burner flame.
4A30.10bimetal stripHa-5Strips of dissimilar metals bonded together bend when heated.
4A30.10bimetallic strip25-2.2A pointer is mounted on the end of a bimetallic strip. Picture.
4A30.10bimetal stripH-21Two 25 cm strips of brass and invar steel are welded together for use as a bimetal strip.
4A30.10bimetallic stripH-2a.5Just a picture.
4A30.10bimetallic stripDisc 14-08Heat the commercial bimetallic strip in a flame.
4A30.11thermostat modelPIRA 1000
4A30.11thermostatHa-6A small bimetal strip acts as a switch in a thermostat.
4A30.11bimetallic strip thermostatH-22Set up a bimetallic strip thermostat to ring bells or flash lights.
4A30.11thermostat modelDisc 14-09A bimetallic strip bends away from an electrical contact when heated turning off a light.
4A30.12turn signal oscillatorAJP 55(10),954Two types of turn signal oscillators that use bimetal strips are discussed.
4A30.15wire coil thermostat - zigPIRA 1000
4A30.20balls and ringPIRA 200A ring with a set of two balls, one over and one under size. Heat the ring and lslip over both.
4A30.20balls and ring4A30.21
4A30.21ball and ringHa-7A ball passes through a ring only when it is heated.
4A30.21ball and ringH-15A ball passes through a snugly fitting ring when both are at the same temperature.
4A30.21ball and ringH-2a.4Just a picture.
4A30.22thermal expansionDisc 14-11A brass plate with a hole is heated until it fits over a ball.
4A30.23shrink fitH-16Heat a brass ring and slip it onto a slightly tapered steel bar and pass around the class.
4A30.30break the boltPIRA 500
4A30.30break the bolt4A30.30Heat a iron bar, then tighten it in a yoke so it breaks a cast iron bar when the bar cools.
4A30.30forces caused by change of lengthHa-10A heavy iron bar heated and placed in a yoke breaks a cast iron bolt as it cools.
4A30.30break the boltH-17A heated bar is tightened in a yoke against a cast iron peg which breaks as the bar cools.
4A30.30pin breakerDisc 14-10Heat a rod to break a 1/8" diameter pin by expansion.
4A30.31break the boltH-18A drill rod clamped between a inner steel rod and an outer brass tube breaks when the brass tube is heated. Diagram.
4A30.40hopping discsPIRA 1000
4A30.40hopping discsHa-11Bimetal discs hop on guide wires between hot and cold plates.
4A30.45bending glass by expansionH-13One edge of a strip of plate glass is heated with a Bunsen burner causing the glass to bend toward the cooler side.
4A30.46Trevelyan rockerH-24A brass or copper rocker heated and placed on a lead support will rock due to expansion of the lead. Diagram.
4A30.50expansion of quartz and glassPIRA 1000
4A30.50expansion of quartz and glass4A30.50
4A30.50expansion of quartzHd-8Quartz and glass tubes are both heated with a torch and plunged into water.
4A30.50expansion of quartz and glassH-25Heat a piece of quartz tube and quench it in water. Try the same thing with Pyrex and soft glass.
4A30.55expansion of a tubeHa-8Steam is passed through an aluminum tube and a dial indicator shows the change in length.
4A30.55expansion tubeH-12One end of a tube rests on a needle attached to a pointer that moves as the tube is heated.
4A30.60sagging wirePIRA 500
4A30.60sagging wire4A30.60
4A30.60sagging wireH-9Heat a length of nichrome wire electrically and watch it sag. ALSO - Recalescence temperature of iron (800 C).
4A30.60linear expansion of a wireH-2bA wire is heated electrically and a pointer indicates change of length. Also recalescence of iron.
4A30.60thermal expansion of wireDisc 14-07A long iron wire with a small weight hanging at the midpoint is heated electrically.
4A30.61expanding wireH-10One end of a heated wire is passed over a pulley to a weight. The pulley has a pointer attached.
4A30.65bridge expansionH-14Either the wire or the roadway can be heated in this model of a suspension bridge.
4A30.69gridiron pendulumH-23A gridiron pendulum of constant effective length when heated is made of tubes of brass and zinc.
4A30.80heat rubber bandsPIRA 1000
4A30.80heat rubber bands4A30.80
4A30.80heat rubber bandsAJP 31(5),3971) Pass out rubber bands, have the students stretch them while holding against lips, then wait and reverse for cooling. 2) Hang a 1 kg mass from four rubber bands so it touches the table, heat 20 sec with a heat lamp and the mass will lift 1 cm.
4A30.80thermal properties of rubberHm-4Rubber tubing inside a copper shield contracts as it is heated.
4A30.80heat rubberH-19Hang a 100 g weight from a rubber band and heat with a radiant heater. Or, enclose a rubber tube in a brass cylinder and heat with a Bunsen burner.
4A30.80rubber band on lipsH-173Pass out rubber bands for the students to put on their lips to feel the change in temperature as they stretch and unstretch.
4A30.82heat rubberH-20A complex apparatus that oscillates as a rubber band is heated and cooled.

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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