Wage incentive

Wake flow

Wake-wash prediction

Walking on water

Wall construction

Walnut

Warm-air heating system

Warship design trends

Washer

Waste-to-energy

Wastewater reuse

Wastewater treatment for deployed military forces and disaster response

Watch

Water

Water conservation

Water desalination

Water hammer

Water on the Moon

Water pollution

Water resource

Water softening

Water supply engineering

Water table

Water treatment

Water tunnel (research and testing)

Water-jet cutting

Water-tube boiler

Waterborne disease

Waterjet

Watermelon

Waterpower

Waterspout

Watt balance

Watt-hour meter

Wattmeter

Wave (physics)

Wave energy converters

Wave equation

Wave mechanics

Wave motion

Wave optics

Wave packets

Wave packets

Wave processes and shoreline change

Wave slamming

Wave-particle duality

Wave-shaping circuits

Waveform

Waveform determination

Waveform generator

Waveguide

Wavelength

Wavelength measurement

Wavelength standards

Wavelets

Wavellite

Weak nuclear interactions

Weakly interacting massive particle (WIMP)

Wear

Weasel

Weather

Weather forecasting and prediction

Weather map

Weather modification

Weather observation

Weather observation with enhanced radar techniques

Weathering processes

Web 2.0

Web spam identification and blocking

Web to print

Wedge

Weeds

Weight

Weightlessness

Welded joint

Welding and cutting of materials

Well

Well logging

Wellpoint system

Welwitschiales

Wentzel-Kramers-Brillouin method

West Indies

West Nile virus

Wetland

Wetting (physical chemistry)

Whale theft of fish from longline fisheries

Wheat

Wheatstone bridge

Wheel and axle

Wheelbase

White dwarf star

White space

White-nose syndrome of bats

Whole genome association studies

Whooping cough

Whooping crane restoration

Wi-Fi

Wide-Area Augmentation System (WAAS)

Wide-area network

Wide-area power system protection and control