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Light Through Milk Fat?

Light Through Milk Fat?. Beer’s Law. some of the light. When shining. LIGHT. is absorbed. through a sample. The amount of light absorbed depends on many factors, including:. thickness of sample. type of material. COLOR ,. and. What color does seawater absorb?. mostly the reds!.

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Light Through Milk Fat?

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  1. Light Through Milk Fat?

  2. Beer’s Law some of the light When shining LIGHT is absorbed through a sample The amount of light absorbed depends on many factors, including: thickness of sample type of material COLOR , and

  3. What color does seawater absorb? mostly the reds! What if we replace the red light taken from the sun?

  4. Light absorbed in seawater Blue is absorbed least

  5. Light absorbed in seawater

  6. So absorption of light is… …transfer of energy to the medium through which it travels …described by Beer’s Law Energy enters as light, but less emerges as it is converted to heat heat energy absorbed = + light energy in lightenergy out

  7. What about scattered light? Scattered light on a surface: bounces back inall directions. Scattered light through a solution: bounces inall directions… …so some light makes it through! (you can see it)

  8. Blue Skies come from scattering BLUE light

  9. Blue light is scattered the most by the atmosphere

  10. Since blue is scattered most in the atmosphere, sunsets are anything but blue, appearing reddish-orange.

  11. Sunsets are anything but blue

  12. Instead of air in the atmosphere, let’s look at milk fat in water +

  13. Homogenized milk contains many small globules of fat 0.2 mm diameter FOV Why milk? Each mL of 2% milk contains about 10 million globules …this “population density” is about 1010 globules/L Visible light is scattered nicely by these globules

  14. How does the glob population relate to the amount of light scattering? Higher density of particles leads to more scattering, and less light transmitted through the solution... low transmissionmeanshigh concentration

  15. So if we shine a laser through a tank with some milk fat… …and measure the light that makes it through… laser light sensor Tank of milk and water …we can determine the concentration of fat globules!

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