Basic week_03 Physics1 Fall 2010

Basic week_03 Physics1 Fall 2010 - TonightsTopics s Water...

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Tonight’s Topics Water Compared to Air Density Compressibility Heat Capacity and Transmission Light Sound
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Tonight’s topics (continued) Pressure Primary Effects of Pressure (part 1) Pressure/Volume/Density relationships Air Consumption and Depth Your Body’s Air Spaces Squeezes and Blocks Equalization of Pressure This week in the pool
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State some of the characteristics of air. Describe the concept of pressure and how it affects  volume and density of a gas. Describe how pressure affects air spaces in our body. State how to prevent problems from pressure changes. Performance:    By the end of the lesson you will be able to :
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Water Compared to Air Water = liquid Not compressible Heavy Fresh water 62.4 lbs / cu. ft. 1 kg / liter Density = mass per unit volume Seawater is about 2.5% heavier 64 lbs / cu. ft. || 1.025 kg / liter Air = gas Compressible Light (sea level) ~2 lbs / cu. yard ~1 kg / cu. meter
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Water Compared to Air ( continued) Water is about 800 times denser than air. When you descend in water, the pressure  increases rapidly. Total pressure = combined pressure of the  weight of air and water. Density of water stays the same at depth.
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The Air We Breathe Air is a mixture of gases. Air can be easily compressed: When pressure is applied to a volume of air, it will be forced to occupy a smaller volume and its density will increase. The air at sea level is denser (“thicker”) than the air at higher altitudes. The weight of the air above compresses the air below.
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In the Water Water affects our  Vision Hearing Ability to retain heat How we move through it Underwater, we are all disabled. Diving equipment helps us  overcome our disabilities.
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  Vision: Our eyes are designed to work in the air. Underwater, light rays entering the eye are not refracted (bent) as much. The image does not focus at the retina. Underwater everything appears blurred. The mask provides an air space in front of our eyes. With a mask, the light is bent twice,
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Basic week_03 Physics1 Fall 2010 - TonightsTopics s Water...

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