How many grains of sand are there in an hour glass?

Answer 1

Diameter of a grain of sand = 0.2 mm Volume of a grain of sand = 0.0042 mm^3 Volume of bounding box = 0.008 mm^3 Volume of a 3 minute times = 2 cm^3 = 2000 mm^3 Grains of sand in a 3 min timer = 2,000/0.008 = 250,000 grains Grains of sand in a 1 hour timer = 250,000 x 60 / 3 = 5,000,000

Answer 2

depends on the type and size of the sand.

Smaller particles will be able to fill a gallon container more effectively, leaving less room for air

The type and composition of the sand will determine the density of the sand

Answer 3

That will strongly depend on both the cross-sectional area of the regulating orifice,
and the duration of the time period that the device is designed to delineate.

Answer 4

The answer will depend on the design of the hourglass.

Answer 5

2,000 pounds.

Answer 6

One pound?

Answer 7

69

Answer 8

31

Answer 9

93

Answer 10

12