What is Film: Definition and 345 Discussions

A film, also called a movie, motion picture or moving picture, is a work of visual art used to simulate experiences that communicate ideas, stories, perceptions, feelings, beauty, or atmosphere through the use of moving images. These images are generally accompanied by sound, and more rarely, other sensory stimulations. The word "cinema", short for cinematography, is often used to refer to filmmaking and the film industry, and to the art form that is the result of it.
The moving images of a film are created by photographing actual scenes with a motion-picture camera, by photographing drawings or miniature models using traditional animation techniques, by means of CGI and computer animation, or by a combination of some or all of these techniques, and other visual effects.
Traditionally, films were recorded onto celluloid film stock through a photochemical process and then shown through a movie projector onto a large screen. Contemporary films are often fully digital through the entire process of production, distribution, and exhibition, while films recorded in a photochemical form traditionally included an analogous optical soundtrack (a graphic recording of the spoken words, music and other sounds that accompany the images which runs along a portion of the film exclusively reserved for it, and is not projected).
Films are cultural artifacts created by specific cultures. They reflect those cultures, and, in turn, affect them. Film is considered to be an important art form, a source of popular entertainment, and a powerful medium for educating—or indoctrinating—citizens. The visual basis of film gives it a universal power of communication. Some films have become popular worldwide attractions through the use of dubbing or subtitles to translate the dialog into other languages.
The individual images that make up a film are called frames. In the projection of traditional celluloid films, a rotating shutter causes intervals of darkness as each frame, in turn, is moved into position to be projected, but the viewer does not notice the interruptions because of an effect known as persistence of vision, whereby the eye retains a visual image for a fraction of a second after its source disappears. The perception of motion is partly due to a psychological effect called the phi phenomenon.
The name "film" originates from the fact that photographic film (also called film stock) has historically been the medium for recording and displaying motion pictures. Many other terms exist for an individual motion-picture, including picture, picture show, moving picture, photoplay, and flick. The most common term in the United States is movie, while in Europe film is preferred. Common terms for the field in general include the big screen, the silver screen, the movies, and cinema; the last of these is commonly used, as an overarching term, in scholarly texts and critical essays. In early years, the word sheet was sometimes used instead of screen. 'Film' in general is not a good term to refer to a long standard commercial video production since it’s ambiguous in general and therefore requires context for correct interpretation.

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  1. M

    I Thin film around circle and ignoring curvature

    Hi PF! If we have flow around a curved object that is sufficiently thin, I Have seen many texts assume the surface is linear rather than curved. Can someone help me with what "sufficiently thin" is quantitatively and how this allows us to neglect surface curvature? As a simple toy problem...
  2. F

    Thin film interference - why thin, exactly?

    Hi, in every explanation of thin film interference I came across, little or nothing is said as to why the layer of transparent material creating the effect should be thin. What would go wrong if that is not the case? I'm asking because it seems to me that, in principle, the mathematic...
  3. N

    I Diameter of nanoparticles formed by dewetting of thin film

    Hi, I'm trying to understand the derivation to an equation I found in the following paper: http://pubs.acs.org/doi/abs/10.1021/nn203035x I posted almost this exact question on Physics Stack Exchange but got no replies so I decided to try it here instead, I hope that's ok...
  4. D

    Why when I freeze a container does the humidity go down?

    I am working on a project to stockpile and freeze photographic film and paper for later use. This is not for academic or commercial purposes, but just for personal use. I've been experimenting and am stumped as t the following: I place a package of film in a ziplock bag in an environment of...
  5. N

    Thermal conductivity of a thin film

    Homework Statement The problem is given. Homework EquationsThe Attempt at a Solution I tried to solve the question as if there is a nanowire between two reservoirs and got an answer. But I don't know what should I do to measure thermal conductivity in a thin film. My formula for k in a...
  6. A

    The thinnest film in which the reflected light will be a max

    Homework Statement Monochromatic light, at normal incidence, strikes a thin film in air. If λ denotes the wavelength in the film, what is the thinnest film in which the reflected light will be a maximum? A λ/4 B 3λ/4 C λ D much less than λ E λ/2...
  7. Cocoleia

    Thin film appears red, thickness of this part?

    Homework Statement A thin film of oil (n=1.5) is floating on top of water. When looking directly at this film, a large portion appears red (700nm). What is the thickness of the red part of the layer? Homework EquationsThe Attempt at a Solution Since n for oil > n for air, there will be a phase...
  8. Cocoleia

    Thin film interference and external / internal reflection

    Homework Statement I am working on a thin film interference problem where i have to find the phase difference. What is the relationship between external/internal reflection and the thin film interferenceHomework Equations for external: [/B] for internal: The Attempt at a Solution So far i...
  9. sounouhid

    Thin film refractive index determination

    Hi every one , I want to find the refractive index of a thin film using it's reflectance and transmittance spectrum is there a way to do that ? thank you for advance
  10. S

    Thickness of film for maximum interference

    Homework Statement As shown in the figure below, beams of light whose wavelength in air is 600 nm are perpendicularly incident upon two transparent thin films (A and B) in the same phase. The thickness of A and B is l. The refractive indices of A and B are, respectively, nA and nB. The...
  11. S

    Reflective solar shortwave & emissive long range film?

    Looking for recommendations for two commercially available films and coatings, the best for... #1 - Maximum reflectance, regardless AOI, for short wave sunlight primarily and, secondarily, reflects some or a lot of long wave, and thirdly, also good emissivity for any of the spectrum. Appreciate...
  12. M

    Polarization-electric field hysteresis loop of a piezoelectric film.

    Hello, I have piezoelectric film. I want to characterize ferroectricity. which exact equipment and circuit are used for measuring polarization-electric field hysteresis loop. Thanks
  13. S

    B Are UV Films for Windows Really Effective in Blocking UV Rays?

    Hey everyone. Just a basic question out of curiosity. How effective are UV films for windows for blocking UV rays? Every window film I see says it blocks 99% of UV rays. I just put them in my house, and honestly, I find it hard to believe that it is blocking 99% of UV rays (that being rays from...
  14. U

    What is the (n,k) value of hydrogenated amorphous silicon carbide?

    Hello, I'm working on simulation of hydrogenated amorphous and microcristalline silicon solar cells. The software I use is AMPS 1D So, I need (n,k) of hydrogenated amorphous silicon carbide (a-SiC:H) Thank you
  15. R

    Uncovering Wavelengths Not Reflected in a Soap Bubble Film

    1. The problem statement, all variables and given/known da A soap bubble 500 nm thick is illuminated with white light. The index of refraction of this unique soap film is 1.35 for all colors (no dispersion). a) What wavelengths are not reflected? Homework Equations 2nt=mL 2nt=m(L/2) The...
  16. kenok1216

    About thin film (max bright/dark)

    Homework Statement Homework EquationsThe Attempt at a Solution SiO2 as the thin film,when light entry SiO2 and Si then the reflected light has 180 phase change, for dark fringes 2nt=(m+1/2)λ for bright fringes 2nt=mλ for dectect max of bright/dark,-1<=sinx<=1, then no idea to prove father[/B]
  17. T

    Light wave incident on and passing through a thin soap film

    here is the problem. i got 0.5 from the fact that thickness = (m)(lambda)/(2nf) other equation for thickness is thickness = (m+1/2)(lambda)/(2nf)
  18. jtbell

    News RIP Ken Adam, film set designer

    One of his most notable creations was the War Room in Kubrick's Dr. Strangelove. He also did sets for the 1960s James Bond movies. Washington Post Berlin Film Journal
  19. R

    Thin Film Interference: Can You Have a Phase Difference>2pi

    If the equation for phase difference, 2(pi)(path difference/wavelength) gave you a value like 12.25pi would that be the phase difference or would it be .25pi?
  20. SlowThinker

    What is the significance of Horizon, the fan film released on Friday?

    Hello, a long-awaited fan film has been released on Friday. I'd say it's pretty good.
  21. TheMathNoob

    Help with literature essay about the film Thelma and Louise

    Prompt 3. How do you read the final scene of Thelma and Louise? Is it a fitting conclusion to the film? Does it shed new light on meanings of the road? The main topic in the course is road narratives. I need feedback for my essay. It's just a 3 page essay. I need also new ideas to finish my paper.
  22. W

    Falling Film Problem: Velocity Profile Independent of z

    Homework Statement This is not exactly a homework problem. I am trying to review material so that I can tutor it this semester. In the falling film problem, as described in this link: http://www.syvum.com/cgi/online/serve.cgi/eng/fluid/fluid204.html, I am confused why the velocity profile does...
  23. Khoa

    Measure thickness of coating film on Zinc Plating Steel

    Hi All, I'm searching for the possible method to determine organic coating thickness cover on steel tole was plated by thin zinc layer. Additionally, I also want to measure thickness zinc plating layer in between these layers (coating on top & steel on bottom) without destructing them. Please...
  24. D

    What is the Impact of Laughter on Learning?

    I was born and raised in Czechoslovakia (currently the Czech Republic) where I completed my Masters degree in Physics and Philosophy. I recently completed my PhD in science education and I am looking for "my place" in academia. In my dissertation I focused on a problem of students' understanding...
  25. S

    Shell & Tube Falling Film Evaporator Nickel Tubes Collapsed

    An unfortunate incident happened at our triple effect caustic evaporator (32w.t% to 51w.t%). The third effect (highlighted red) where major steam (~12-13bar depending on flowrate) assisted evaporation take place, here for some reason Ni tubes get severely collapsed, while the plant was offline...
  26. C

    Reflection and Film Problem

    Homework Statement You are designing a thin transparent reflective coating for the front surface of a sheet of glass. The index of refraction of the glass is 1.52 and when it is in use, the coated glass has air on both sides. Because the coating is expensive, you want to use a layer that has...
  27. Q

    Constructive/Destructive Interference in a Thin Oil Film

    Hi PhysicsForums, Here's a thin film interference question I'm having problems with. An oil film (n=1.50) floats on a water body (n=1.33) in an air environment. Normal incident white light is reflected by the oil film. But in the spectrum of reflected light, 500nm and 700nm light are missing...
  28. RyanH42

    How Many Frames Are Needed to Show a 2 Hour Motion Picture on 35 cm Film?

    Homework Statement The height of motion picture film's frame is 35 cm.If 24 frame go by 1 sec calculate the total number of frames required to show ia 2h long motion picture. Homework Equations simple Equation which I don't need to write here I guess The Attempt at a Solution The Height of...
  29. Greg Bernhardt

    The Martian Movie - Survival Thriller

    Who is excited for this film? I love survival films and his one is hot on my radar! http://www.imdb.com/title/tt3659388/
  30. Greg Bernhardt

    Ridley Scott Talks 'Prometheus 2' Film

    I for one really enjoyed the first Prometheus. Yes there were some plot holes, but it was spooky and haunting. Plus the Alien universe is so cool! Anyway, here is a new Interview on Ridley Scott about the title and movie etc. http://www.heyuguys.com/prometheus-2-title-ridley-scott-interview/
  31. F

    Ellipsometry of thicker SiO2 film over bulk Si substrate

    Dear All, I hope you are good. But I am stuck in a measurement. I use JWoollam Ellipsometer and WVASE 32 software to perform ellipsometric measurements of a wafer which contains Silicon as substrate and SiO2 8 um as film over it. I performed a number of measurements on different points of the...
  32. P

    Thin film physicist unfairly targeted by Justice Dept.

    Not really physics, but I thought this forum would be most interested in this. http://gizmodo.com/charges-dropped-against-temple-university-physicist-acc-1730326640 http://www.nytimes.com/2015/09/12/us/politics/us-drops-charges-that-professor-shared-technology-with-china.html
  33. mesa

    Looking for a boron nitride sheet for thin film dep / Fusion

    Hello fellow PFers. Recently we ran our first fusion experiment on campus by utilizing our IBeAM analysis lab with a BN electrical insulator target after installing and calibrating a gamma detector in the vacuum chamber. The Professor funding the experiment needed to see we could achieve a...
  34. S

    Do X-Ray Tracks in Photo Film Suggest Quantum Entanglement?

    In Understanding Quantum Mechanics, Ch.1, Sec. 5 Roland Omnes says: ".. hard x-rays can leave straight-line tracks in photographic emulsion and this is strongly reminiscent of a particle trajectory." How can we describe this in terms of the wavefunction / interaction / measurement paradigm? Is...
  35. K

    B How to compare camera film ISO number to quantum efficiency?

    The efficiency of a scientific camera like http://www.princetoninstruments.com/products/imcam/proem/ is specified by the quantum efficiency vs wavelength. The meaning is simple enough. Assuming a fill factor of 1, it's the fraction of incident photons that generate a charge. But photographer...
  36. M

    Thickness of a film given wavelength and phaseshift....

    A wavelength of incident light on a thin film is given, and also is known how much the rays coming out from the top surfaces are out of phase. How can be the thickness of the film calculate?
  37. G

    Could 'Interstellar' Inspire a New Generation of Space Enthusiasts?

    I know if takes some liberties (most glaringly the relative time dilation on Miler's planet), but it provides some wonderful scenes. The Launch The Wormhole The Black Hole itself Incredible. I bet it sparks an interest in astronomy and physics for a younger generation
  38. S

    Why no decoherence after reflection from metal film

    When photons reflect from a mirror coated with, say, an aluminium film... the reflection is presumably down to their interactions with free electrons in the metal (and each electron is in an unknown state before and after). Yet the interference does not go away if a mirror is inserted in one...
  39. B

    Minimal film boiling temperature (Core reflooding)

    Hello Forumers and Physics-addicted Fellows! I'm an applied nuclear engineering scientist by profession and thermal physicist by education. well nowadays I'm really involved into the describing the processes in Light Water Reactor core during Emergency Core Cooling System in action. In details...
  40. J

    Solving the Mystery of Wavelength Refraction: A Thin 200nm Film of Oil

    Homework Statement http://lon-capa.bd.psu.edu/res/psuerie/gwb6/physics/optics/e1p4.png A thin 200nm film of oil (n = 2.0) floats on water (n = 1.33). To a normal human, what wavelength will the film appear when viewed from above (nearly perpendicular to the film)? Homework Equations for...
  41. X

    Oil & Water Film: Min Thickness of 313nm

    Homework Statement A thin film of oil (n = 1.50) is spread over a puddle of water (n = 1.33). In a region where the film looks red from directly above (λ = 626 nm), what is the minimum possible thickness of the film? Homework Equations 2nt = (m+0.5)λ t = (m+0.5)λ/2n The Attempt at a...
  42. L

    Can scotch tape method get film size larger than particles?

    Hi there, I am preparing to use the scotch tape method to get hex-Boron Nitride thin film from hBN powder. As far as I know, the available particle size for hBN is 10 um at most, is it possible for me to get hBN thin film using the peel off method with size larger than 10 um? If so, what is the...
  43. R

    Microchannels in a plastic film

    Another grad student and I have figured out a way to create micron-sized channels INSIDE a piece of thermoplastic polymer using a laser. Basically it creates a porous channel inside the material (I attached a microscope image). This is a long channel but the inside of it is not empty - it has a...
  44. S

    Does metal film resistor work at cryogenic temperature (3K)?

    I am trying to use a metal film resistor to limit the current inside a dilution fridge (to reduce noise power from it), but I couldn't confirm if the metal film resistor is going to survive (or it goes superconducting) at ~3 Kelvin, searching a bit on the web but still I couldn't find the...
  45. Y

    Depletion region vs Film thickness

    Here's something I can't get my head around: Take a diode (can be schottky, p-n etc) where the predicted depletion region is larger than the actual thickness of that layer will ever be. What happens? I've seen papers where its assumed that this curtails the built in potential. But it sounds...
  46. L

    Measure the out-of-plane k of suspended thin film

    Hi there, Does anyone know if there is any method to measure the out-of-plane thermal conductivity of a suspended thin film? As the conventional way of measuring the out-of-plane thermal conductivity is to deposit the thin film on a thick substrate, but we want it suspended. Thanks in advance.
  47. Ahmed Khodiri

    Thin Film Thickness: Estimating Using Transmittance & Reflectance

    Is there any program can estimate the thickness of thin film using transmittance and reflectance data ?
  48. M

    Thin film interference reflection

    Homework Statement A coating of n1 = 1.27 material is to be added to n2 = 1.50 glass, in order to make it "irridescent." a) What is the thinnest layer of material which will have a reflection maximum for normal-incidence light at BOTH 400 and 600 nm (vacuum) wavelength? b) This thickness will...
  49. W

    Thin film / interference question

    Homework Statement Monochromatic laser light is shown through a double-slit apparatus with a slit separation of onto a screen, but no interference pattern is seen because the thin transparent coating (index of refraction n=1.35) on the screen is creating a thin-film destructive interference...
  50. W

    RF Susceptor Heating (KHz range) Graphite Foil vs Iron Foil (or thin film)

    Which do you believe is the best choice for a low temperature RF heating susceptor, i.e. - greatest rise in temperature vs. field strength. I am aware that Graphite (expanded graphite foil) has excellent thermal conductance in plane and therefore makes for very even heating patterns over large...
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