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FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Bouncing Putty
plastelina.sk (Wikimedia Commons) · CC BY-SA 2.0
Clay

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Clay

22. september 2026DK
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Bouncing Putty

Looking for a synthetic rubber during the Second World War, James Wright at General Electric heated silicone oil with boric acid. The result was no rubber: it bounced, shattered under a hammer, stretched like toffee when pulled slowly and slumped into a puddle overnight. Nobody found an industrial use; in 1950 it was sold as a toy. **US 2,541,851**, "Process for making puttylike elastic plastic, siloxane derivative composition containing zinc hydroxide", Wright, assigned to General Electric, filed 23. December 1944, granted 13. February 1951: liquid dimethylsiloxane heated with 5 to 25 % by weight of a boron compound such as boric acid or borax. **You measure both of its lives**: how high it bounces, how fast it flows, and where one turns into the other.
Byrjandi
1 hour plus a day of slumping

Leiðbeiningar

1

Weigh a ball

Weigh out 20 g of bouncing putty and roll it into a smooth ball between your palms.

Efni fyrir þetta skref:

SkoppkíttiSkoppkítti20 g

Nauðsynleg verkfæri:

Nákvæm stafræn vogNákvæm stafræn vog
2

Bounce it

Tape a tape measure up a wall. Drop the ball from 1.0 m onto a hard floor five times, filming in slow motion, and read each rebound height.

Efni fyrir þetta skref:

MálningarlímbandMálningarlímband1 rúlla

Nauðsynleg verkfæri:

MálbandMálband
Snjallsími með hægmyndatökuSnjallsími með hægmyndatöku
3

Pull slow, pull fast

Roll a 10 mm thick rope. Pull one over 10 seconds: it strings out. Pull another sharply: it snaps with a clean face. Try pull times in between and note the fastest pull that still stretches.

Nauðsynleg verkfæri:

SkeiðklukkaSkeiðklukka
MálmreglustikaMálmreglustika
4

Strike it

Glasses on. Set a ball on a hard surface and hit it once, sharply, with the mallet. It cracks rather than squashing. Squash another slowly with your thumb.

Nauðsynleg verkfæri:

GúmmíhamarGúmmíhamar
Tær öryggisglerauguTær öryggisgleraugu
5

Let it slump

Re-roll the 20 g ball and set it on wax paper on a level surface. Measure its diameter now and after 10, 30, 60 and 180 minutes and 24 hours.

Efni fyrir þetta skref:

VaxpappírVaxpappír1 plata

Nauðsynleg verkfæri:

Stafrænn skífmælir 6 tommurStafrænn skífmælir 6 tommur
6

Deborah numbers

Hleð Jupyter-vinnubók…
7

History & Context

**What the patent specifies:** liquid dimethylsiloxane heated with 5–25 % of a boron compound until putty-like. **Modern build (derived):** commercial bouncing putty, measured. It became a famous toy and a staple of physics teaching about materials that are neither simply solid nor simply liquid. Its limits: it picks up dirt, will not hold a shape, and flows out of any container that is not closed.

Efni

3

Nauðsynleg verkfæri

8

Tengd Blueprint

Þessi blueprint deila þekkingu — tækni, efni eða meginreglur

Silicone (Rochow Direct Process)

Silicone (Rochow Direct Process)

eftir ClayDK

Plastgerð

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Butyl Rubber

Butyl Rubber

eftir PennyDK

Vélfræði

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CC0 opinbert ríki

Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.

Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.

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