alternative source of light 2003

8/13/2019 Alternative Source of Light 2003

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By

Karthikeyan

Department Of Electrical And ElectronicsEngineering


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CONCEPTS TO COVER

SOURCES OF LIGHT

GLOW STICKS

HOW DOES IT WORK ?

FREEZING/HEATING

USES

DANGERS


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GO TO ARTIFICIAL

SOURCES

NATURAL SOURCES


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ARTIFICIALSOURCES

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WHAT IF WE USE CHEMICAL

ENERGY TO OBTAIN LIGHT ???

CHEMICAL ENERGY LIGHT ENERGY


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IS IT POSSIBLE ???

YES!!!

By Using

GLOW STICKS


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A glow stickis a single-use translucent plastic tubecontaining isolated substances which when combinedmake light through a chemical reaction-induced chemiluminescencewhich does not require an

electrical power source.

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Glow sticks give off light when two solutions are allowedto mix.

The sticks consist of a small fragile container within aflexible outer container.

Each container holds one of the two solutions. When theouter container is bent, it breaks the inner container,releasing the first solution into the second solution.

After breaking, the tube is shaken to mix the twocomponents.

Usually to activate this reaction, you simply bend theglow stick.


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It is a common belief that glow sticks may beplaced in a freezer to slow the chemicalreaction, allowing the same sticks to be keptfor two or three night's activity.

In reverse, microwaving or running hot waterover them speeds upthe photon release andmakes them brighter, but also diminishes thelife of the glow stick.

This however usually depends on the specific

composition of chemicals in the particular glowstick at hand.

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USES

Glow-sticks are waterproof, do not use batteries,generate negligible heat, are inexpensive, and arereasonably disposable.

They can tolerate high pressures, such as those found

underwater.They are used as light sources and light markersby military forces, campers, and recreationaldivers doing night diving.

Glow sticks are considered the only kind of light source

that is ideal safe for use immediately followingan earthquake, hurricane, tornado, or other catastrophicemergency situationdue to the fact that they do not useany kind of electricity to work.

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Dangers

Glow sticks contain hydrogen peroxide,and phenolis produced as a by-product.

It is advisable to keep the mixture awayfrom skinand to prevent accidental

ingestion if the glow stick case splits orbreaks.

If spilled on skin the chemicals could causeslight skin irritation, swelling, or, inextreme circumstances, vomitingand

nausea.The sensitizers used arepolynucleararomatic hydrocarbons, a class ofcompounds known for their carcinogenity.

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IS IT AVAILABLE IN THE STORES???


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alternative source of light 2003

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