Density;
Density is a substances mass per unit of volume. Some substances are heavier than others. Comparative weights of gases, liquids, and solids may be shown by either density or specific gravity. Density is expressed as pounds per cubic foot. Or kilograms per cubic meter.
Force, Force applied to a body at a rest causes it to move. the unit of force is the pound force. in si metric units, it is the newton N. The pound force is that force which, applied to a one pound mass, will results in an acceleration of 32.137 ft.
at the surface of the earth, where the acceleration of gravity is 32.173 ft., a 1 lb mass weights 1 lb. Force it exerts 1 lb force on the surface upon which it rest. If the object of 1 lb mass were on the moon where the gravity is about 1/6 that on earth, the weight would be 1/6 lb.
Gas, A gas is any physical substance which must be enclosed in a sealed container to prevent its escape into the atmosphere. The molecules, having little or no attraction for each other, Travel, Fly in a straight line. They bounce off each other, off molecules of other substances, or off the container walls. they have little or no attraction for any other substance. The pressures shown in the gas filled Baloon illustrate how gases behave.
Almost any substance can be made to exist as a Solid, a liquide, or a gas. Any molecule can be made to Viberrate, Swim, or fly. It depends on two things;
Temperature And Pressure! , To understand this change of state, one must study Temperature and Pressure Relationships...
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Effect Of Pressure on Freezing Temperature of Water.
The Temerature at which water freezes is affected by the pressure on the surface of the water. Increasing the pressure Lowers the Freezing Temperature. Decreasing the pressure raises the Freezing Temperature. The relationship goes the opposite way from the general rule given in ... This is because water Expands when it freezes. Most substances Expand when they Melt, and obey the rule. For then the higher the Pressure,,, The Higher the Melting Temperature...
