Exploring the Colours of Soap Films in Motion
Δημοσιεύτηκε στις 24 Οκτ 2016
This
film, possibly made at the Royal Institution in the early 1930s by ASG
Lawrence, demonstrates the colours produced in soap films when a steady
jet of air is directed over the surface. Soap films are thin layers of
liquid surrounded by air. The soap film shown has been created by
dipping a wire ring into a soap solution to form a thin film of the
solution stretched flat across the ring. The viewer sees the switch from
black and white, setting up of the demonstration, to colour to allow
the bright iridescent colours produced by the interfering of reflected
light waves, a process called thin film interference which is determined
by the thickness of the film, to be shown. The air jet over the soap
film allows streams and vortex patterns in a great variety of colours to
form themselves over the film. On stopping the air jet, the colours
re-arrange themselves to their previous positions, rising or falling in
coloured showers according to their thickness relative to the position
on the film at which they are released from motion.
This early
demonstration film shows the further phenomena of soap films, the
symmetrical patterns produced when the air jet is glanced off the film
surface, the response of the soap film to sound disturbance, and the
effect known as the 'black' condition where the soap film thins out to a
few molecules of soap and water, passing beyond the stage at which
interference colours can be produced. The demonstration goes on to show
the effect that a wet pad of ammonia solution has on the soap film when
held near. There is a further demonstration of rapidly producing the
'black' stage across the soap film, with the normally smoothly graded
bands usually seen now being broken up by the rapid development, as the
black area quickly extends by the aggregations of black 'clots' all over
the soap film. The film ends with a nozzle pierced with four air holes
sending air jets over the soap film surface, producing patterns of
extended symmetry and beauty of contrast.
For this film, and
several others in our collection, we have tried to contact any known
copyright holders and believe it to be an orphan work. If you are the
rights holder, would like it to be taken down, or have any more
information, please get in touch at richannel@ri.ac.uk.
Subscribe to our other YouTube channel for weekly science talks and
explosive short films:https://www.youtube.com/user/TheRoyal...
We're on twitter: https://twitter.com/ri_science
and Facebook: http://www.facebook.com/royalinstitution
and Tumblr: http://ri-science.tumblr.com/
film, possibly made at the Royal Institution in the early 1930s by ASG
Lawrence, demonstrates the colours produced in soap films when a steady
jet of air is directed over the surface. Soap films are thin layers of
liquid surrounded by air. The soap film shown has been created by
dipping a wire ring into a soap solution to form a thin film of the
solution stretched flat across the ring. The viewer sees the switch from
black and white, setting up of the demonstration, to colour to allow
the bright iridescent colours produced by the interfering of reflected
light waves, a process called thin film interference which is determined
by the thickness of the film, to be shown. The air jet over the soap
film allows streams and vortex patterns in a great variety of colours to
form themselves over the film. On stopping the air jet, the colours
re-arrange themselves to their previous positions, rising or falling in
coloured showers according to their thickness relative to the position
on the film at which they are released from motion.
This early
demonstration film shows the further phenomena of soap films, the
symmetrical patterns produced when the air jet is glanced off the film
surface, the response of the soap film to sound disturbance, and the
effect known as the 'black' condition where the soap film thins out to a
few molecules of soap and water, passing beyond the stage at which
interference colours can be produced. The demonstration goes on to show
the effect that a wet pad of ammonia solution has on the soap film when
held near. There is a further demonstration of rapidly producing the
'black' stage across the soap film, with the normally smoothly graded
bands usually seen now being broken up by the rapid development, as the
black area quickly extends by the aggregations of black 'clots' all over
the soap film. The film ends with a nozzle pierced with four air holes
sending air jets over the soap film surface, producing patterns of
extended symmetry and beauty of contrast.
For this film, and
several others in our collection, we have tried to contact any known
copyright holders and believe it to be an orphan work. If you are the
rights holder, would like it to be taken down, or have any more
information, please get in touch at richannel@ri.ac.uk.
Subscribe to our other YouTube channel for weekly science talks and
explosive short films:https://www.youtube.com/user/TheRoyal...
We're on twitter: https://twitter.com/ri_science
and Facebook: http://www.facebook.com/royalinstitution
and Tumblr: http://ri-science.tumblr.com/
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