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2015-09-17T20:15:21+05:30

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When a block of mass m is kept on a surface of area A = 15 cm², the weight acts on the surface, resulting in a pressure P.

   Force = m g = P * A
           m = 1000 Pa * 15 *10⁻⁴ m² / 10 m/sec²
               = 0.15 kg

 The block rests now on a smaller surface area.  So the weight of the block = m g acts (is spread) on the new surface area =>

          Pressure = 0.15 kg * 10 m/s² / [ 10 * 10⁻⁴  m² ]
                        = 1, 500 Pa
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