Increasing the Speed of Light

Increasing the speed of light, just slightly, by removing air molecules, observing the speed limit.

Air slows down light. The refractive index of air is 1.00025, slowing light by 1/4000.
The interferometer splits the light into two paths. In 2 experiments the air is made thinner in one of the paths. So the light will reach the combiner one period earlier ( 0.00217 ps ).

In experiment 1. the air is heated over a distance of 2x5mm by 100°C. The resulting shift is one fringe.

In experiment 2. the pressure is lowered over a distance of 2x50mm. A pencil-stand is prepared as a cuvette and the pressure is measured with a water pipe and a ruler. The pressure decrease for the delay of one period is 2.4 kPa which is 24 cm water column. The measurement shows a value in the range around 25 to 30 cm, a litte bit more, as there is a small leak in the sealed pencil-stand.

For each 1cm water column the delay is about 100 atto seconds. 0.000 000 000 000 000 1 s. It is amazing to set such a fine tuned time delay with a pencil stand and a ruler. :o)

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Erhöhung der Lichtgeschwindigkeit, - nur ein wenig, -
und unter Beachtung der Geschwindigkeits-Beschränkung.

Luft senkt die Lichtgeschwindigkeit. Der Brechungsindex von Luft ist 1,00025 dadurch wird Licht um 1/4000 langsamer.
Das Interferonmeter teilt das Licht in zwei Wege. In den zwei folgenden Experimenten wird die Luft auf jeweils einem der Wege verdünnt, so dass das Licht um eine Periode (0,00217ps) eher am gemeinsamen Treffpunkt eintrifft.

In Experiment 1 wird die Luft auf einer Strecke von 2x5mm um 100°C erhitzt. Dadurch verschiebt sch das Interferenzbild um einen Streifen.

In Experiment 2 wird der Druck auf einer Strecke von 2x50mm reduziert. Ein Bleistiftständer ist als Küvette umgearbeitet und de Druck wird mit einem Wasserrohr und einem Lineal gemessen. Die Messung ergibt einen Wert um 25 bis 30 cm, etwas mehr als erwartet, da der Bleistiftständer etwas undicht ist.

Pro cm Wassersäule ändert sich die Verzögerung um etwa 100 atto-sekunden.
0.000 000 000 000 000 1 s
Es ist schon erstaunlich, wie man eine Zeitverzögerung mit einem Bleistiftständer und einem Lineal so fein einstellen kann. :o)

Category:

Science & Technology

Tags:

• Speed
• of
• Light
• refractive
• index
• air
• Interferometer
• heat
• pressure
• physics
• experiment

[LionHart111]

Nice..

but thats not increasing the velocity of light.

that is calculating the delay in Speed of light due to temperature and pressure..

thats why we measure this absolute value in vacuum..

[manf1234]

The speed of light can be compared on the two ways through an interferometer. There is one way with air under ambient conditions and the other way where the air density is changed over a certain distance. So on this way the delay of the light signal is changed. As the air is made thinner, the speed of light is increased. It sounds a little unusual to increase the speed of light, that is why it was chosen for the title.

[oneirogmophobia82]

Good video. What was your motivation?

[manf1234]

Thank you for the comment. The question is justified as the experiment is not new.

Combining an interferometer with ad hoc equipment like pipes and a pencil stand, putting the things together in half a day (in fact it took me a little longer), making variations of the experiments, considering the values of atto-seconds, that is the motivation.

It was so much fun for me that I want to share it.

[kamalmichael]

i would say you are way head of your time.5 star rating

[AVAMagneticlev]

Please don't stop sharing great work and the maths also helped a lot.

[thesh1zn1t]

killer vid! X)