- snow ice
- snow making
- snowy texture
- soda
- soft tone
- soil warming
- sol
- solar apex
- solar constant
- solar irradiation
- solar refrigerator
- solar thermostat
- solderability test
- soldering test
- solenoid
- solenoid coil
- solid electrolyte
- solid end
- solid helium
- solid hydrogen
- solid insulator
- solid pole
- Solidal cable
- solidification point
- solidification process
- solidified fluid
- solidity
- solidly earthed
- solidly frozen
- solitary wave
- soliton
- soliton-monopole
- solubility
- soluble
- soluble substance
- solution
- solution addition
- solution ceramic
- solution charge
- solution charging
- solution circuit
- solution composition
- solution concentration
- solution concentrator
- solution consumption
- solution contamination
- solution cooler
- solution cooling
- solution cycle
- solution escape
- solution heat
- solution leak
- solution level
- solution line
- solution melting
- solution pump
- solution receiver
- solution recirculation
- solution strength
- Sommerfeld equation
- Sommerfeld formula
- Sommerfeld integral
- sonic barrier
- sonic boom
- soniferous
- sonobuoy
- sonochemistry
- sonometer
- sonority
- sonorous
- sonoscan
- soot number
- sophisticated
- sophisticated equipment
- Soret effect
- sort
- SOS transistor
- sound
- sound absorber
- sound absorption
- sound acceleration
- sound attenuation
- sound attenuator
- sound broadcasting
- sound column
- sound detector
- slag insulation
- slave
- slew rate
- slewing motor
- sliding caliper
- sliding scale
- slip speed
- slot diffuser
- slot meter
- slotted armature
- slotted outlet
- slow death
- smoke analyzer
- smoke duct