هوا کره. Copyright © 2007 Pearson Benjamin Cummings. All rights reserved. Component Percent composition Nitrogen, N 2 78% Oxygen, O 2 21% Argon, Ar 0.9%

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Presentation transcript:

هوا کره

Copyright © 2007 Pearson Benjamin Cummings. All rights reserved. Component Percent composition Nitrogen, N 2 78% Oxygen, O 2 21% Argon, Ar 0.9% Water, H 2 O 0 – 4% (variable) Carbon dioxide, CO % (variable) The Earth’s Atmosphere From Space

The Earth’s Atmosphere 78% Nitrogen 20% Oxygen 1% Argon 0.03% CO 2 Trace Elements ‘The Precious Envelope’ Helium Nitrogen Oxygen Water vapor Argon Neon Carbon dioxide Air

Pressure Which shoes create the most pressure? Courtesy Christy Johannesson Bed of Nails demonstration

Pressure F A = P A P = F Pressure occurs when a force is dispersed over a given surface area. If F acts over a large area… But if F acts over a small area… P = FAFA Mass: 2000 kg 55 kg Foot area: 5000 cm 2 60 cm 2

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