pressure

• describe pressure in fluid

  perpendicular force exerted on surface
• describe affect of increased density on pressure

  increase pressure due to more particles to collide
• describe affect of increased depth on pressure

  increase pressure due to more particles above object causing weight increase
• describe upthrust 


  upward resultant force of submerged object as higher pressure below object than above
• describe factors causing floating

  upthrust larger than weight
• describe factors causing sinking

  weight larger than upthrust
• describe atmospheric pressure 


  air particles colliding with surface
• describe affect of increasing altitude on atmospheric pressure

  decrease pressure due to less particles so collisions and weight above decrease
• describe affect of increasing altitude on atmospheric pressure

  decrease pressure due to less particles so collisions and weight above decrease