Properties of Liquids

Properties of Liquids Definite volume Indefinite shape Particles close together, but can move little bit Liquids can flow

Density liquids much greater than gases Ex: at 25C (room temp) DH2O(l) is 1250x greater than DH2O(g)

Liquids can be compressed but change in volume is very slight & requires enormous pressure

Viscosity Liquids exhibit viscosity Viscosity = resistance to flow

Viscosity depends on: strength of attractive forces sizes & shapes of molecules & temperature

As temperature , viscosity  Easier to flow As temperature , viscosity  More difficult to flow

Oil in engines prevents direct metal to metal contact thin film oil on surfaces needed to prevent flaking of metal oil too thick: won’t circulate at low temps oil too thin: lose film strength at high temps

Surface Tension Particles at surface of liquid: - exist in unbalanced environment - no attraction from above to balance attractions from below

Surface Tension Surface Tension = Energy required to ↑ surface area = measure of inward pull Strong attractive forces  High surface tension

Capillary Action Upward movement of liquid in narrow tube = capillary action

meniscus of liquid: Concave vs Convex

Force(H2O-glass)  Force(H2O- H2O) Force(Hg-glass)  Force(Hg-Hg)