WAsphalt
WBTX (chemistry)
WCadet's fuming liquid
WColloid
WColloid vibration current
WConcoction
WCreosote
WDouble layer (surface science)
WHash oil
WInterface and colloid science
WOuzo effect
WOxyhydrogen
WParticle-size distribution
WPetroleum
WSunscreen
WSurface conductivity
WTar
WZeta potential titration