Each relationship between each layer is different. Like the mantle and the outer core. Its like the mantle is solid and it starts to soften and turn to liquid the deeper you go. Or like the outer...
With increasing altitude in the atmosphere, pressure decreases and so does density. Temperature varies depending on the layer in which the air is. The top of the stratosphere can be -50 degrees C, as...
Given an unchanging volume, if you lower the density you will lower the weight, and the revers is true.
if you lower the weight the the density would lower as well.
This applies to any...
Density refers to the amount of mass per unit volume. Material with high density have a lot of mass in a little space. Objects with a high density sink while objects with a low density tend to float....