Fine grains of beach sand are assumed to be spheres of radius 49.8 µm. these grains are made of silicon dioxide which has a density of 2600 kg/m 3 . what is the mass of each grain of sand? answer in units of kg.

Volume of each grain of sand:

radius of the spherical grain is given,

The grains are made up of silicon dioxide.

The density is equal to

Then, the mass of each grain is given by:

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

it would be kevlar ^^