File:46. Светилка во течен азот.ogg
Original file (Ogg multiplexed audio/video file, Theora/Vorbis, length 56 s, 1,920 × 1,080 pixels, 16.69 Mbps overall, file size: 111.32 MB)
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English: Light bulb in liquid nitrogen
- The light bulb consists of filament hermetically enclosed in a glass vessel filled with inert gas. When an electrical current passes through the filament made out of thin tungsten wire, the metal heats up to red-hot and emits light. During this, the temperature of the filament becomes very high and if there is oxygen present, the filament will burn out. If the glass cover is carefully removed and the filament is immersed in liquid nitrogen, the light bulb continues to shine light. In this case, the liquid nitrogen acts as protective (inert) medium and does not allow the tungsten to burn. If the filament is removed out of the liquid nitrogen, it burns out. Planned and performed by Marina Stojanovska, Miha Bukleski and Vladimir Petruševski, Department of Chemistry, FNSM, Ss. Cyril and Methodius University, Skopje, Macedonia.Македонски: Светилка во течен азот
- Светилката се состои од филамент (влакно) вметнат во стаклен сад исполнет со инертен гас и херметички затворен. Кога низ филаментот (тенка волфрамова жичка), минува струја, металот се усвитува и емитира светлина. При тоа, температурата станува многу висока и ако е присутен кислород, волфрамот ќе се оксидира, а сијалицата ќе „прегори“. Кога ќе се отстрани стаклениот дел од светилката и филаментот се внесе во течен азот, сијалицата продолжува да свети. Течниот азот делува како заштитен (инертен) медиум и не дозволува волфрамот да изгори. Ако се отстрани филаментот од течниот азот, жичката се прегрева и согорува. Осмислено и изведено од Марина Стојановска, Миха Буклески и Владимир Петрушевски, Институт за хемија, ПМФ, УКИМ, Скопје. |
| Date | |
| Source | Own work |
| Author | Deni Ingilizovski |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:07, 3 September 2021 | 56 s, 1,920 × 1,080 (111.32 MB) | Dandarmkd (talk | contribs) | Uploaded own work with UploadWizard |
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