Why is electricity produced at the bottom of dams? When you catch a deep-sea fish, why does its eyes pop- out? Why do your ears pop on an airplane or up in the mountains?

Pick 3 pictures and decide what they have to do with pressure

 Understand the relationship among  Force  Area  Pressure  Write detailed explanations about pressure using scientific language. SKILL FACT

Literacy  When we talk about pressure in Science we use it as a measure of the ratio of how much push or force there is acting on a given surface area.  Simply put if a girl pushes by the same amount on a desk….  The smaller the contact area the larger the pressure is. High Pressure Low Pressure TRY IT!

 What we have done is work out a qualitative idea for pressure; “the larger the area is the lower the pressure.”  However we can describe this mathematically; Force ( N, Newton) Area (m 2 or cm 2 ) Pressure (Pa, Pascal)

 A person pushes on a desk with a force of 10N. The contact area of their finger is 1 cm 2. A = Area (m 2 or cm 2 ) Force ( N, Newton) P = Pressure (Pascal) 10 Pa

 A person pushes on a desk with a force of 10N. The contact area of their hand is 125 cm 2. A = Area (m 2 or cm 2 ) Force ( N, Newton) P = Pressure (N/m 2 or N/cm 2 ) 10 Pa 0.08 Pa

 We can now see the relationship numerically or quantitatively. As the area increases the pressure decreases; A = Area (m 2 or cm 2 ) F=Force ( N, Newton) P = Pressure (Pa, Pascal) 0.08 Pa 10 Pa