The size of the sand will go into play with many other factors. If the size of the neck is narrow and the size of the sand is wide, it will take longer for the sand to pass through. This can also be reversed. If the size of the neck is wide and the size of the sand is narrow, the sand will be able to pass through quickly.
Inside an hourglass, there are two chambers separated by a narrow passage where sand flows from top to bottom. The sand grains move steadily through the passage, creating a visual representation of time passing. The space is confined and continuous, with the flow of sand symbolizing the passage of time and the inevitability of change.
The ''Sand Clock'' is really called an Hourglass, and the reason for that is because it takes the sand and hour to reach the other end of the glass. An hourglass is a curved shaped object that has two ends. The hourglass Has sand inside it which Is placed at the bottom of the hourglass, but when you turn the hourglass up side down, the sand slowly runs through a hole to the other end of the glass. When the sand has finally finished flowing it will end up looking like how it was in the first place.
glass+sand=hourglass
glass+sand=hourglass
sand + glass = hourglass
sand+ glass =one hourglass
glass+sand=hourglass
glass+sand=hourglass
Math is used in a hourglass to make sure you have the proper flow rate for the desired amount of time. If the sand flows too fast then you need to make a smaller opening, if to slow you need too make a wider opening or add more sand.
Any sand used in an hourglass should be dry. If there is any moisture in the sand, it may clump, or simply not flow smoothly through the narrow portion (the metering portion) of the hourglass. As an aside, if you take "regular" sand, spread it out on a canvas in the sun or on a baking sheet in a warm oven, you'll drive off the moisture and end up with dry sand. If your salt is clumping, try drying it in the sun or on a warm (not hot) stove or in a warm oven. Works every time.
An hour's worth.
Hourglass