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P=wave is short for pressure wave. S-wave is short for shear wave. This should suggest a possible reason they behave differently in the (molten) outer core.
Sugar and salt are both soluble in water but behave differently because of their molecular structure. Sugar molecules are polar and form hydrogen bonds with water molecules, while salt molecules dissociate into ions that attract water molecules through ion-dipole interactions. This difference in molecular interactions leads to different dissolution behaviors for sugar and salt in water.
because not all elements and compounds react with each other
Gases behave differently at different pressures and temperatures. At low pressures, gases expand to fill the available space. At high pressures, gases become more compact. At low temperatures, gases condense into liquids or solids. At high temperatures, gases expand and exert greater pressure.
In space, your blood is still red. The lack of gravity does not change the color of your blood. However, in a weightless environment, blood may behave differently due to changes in circulation.