- solid ore
- solid oxygen
- solid point
- solid propellant
- solid residue
- solid rock
- solidification point
- solidified gasoline
- solidified kerosene
- solidified petroleum
- solifluction
- soling material
- solubility coefficient
- solubility curve
- solubility product
- soluble cotton
- soluble gum
- soluble oil
- soluble starch
- soluble tar
- solution annealing
- solution breccia
- solution cavity
- solution consumption
- solution polymerization
- solution power
- solution process
- solution sink
- solutizer
- solutizer process
- solvation
- Solvay process
- solve type
- solvency
- solvent activity
- solvent cleaning
- solvent column
- solvent condenser
- solvent deasphalting
- solvent dewaxing
- solvent effect
- solvent extraction
- solvent layer
- solvent naphtha
- solvent power
- solvent recovery
- solvent refining
- solvent type
- solvent welding
- solvent-refined
- solvolysis
- somma crater
- sommaite
- sonde
- sonic fatigue
- sonic log
- sonic pump
- sonic sonde
- soniobuoy
- sonoprobe
- soot blower
- sooty coal
- sorbate
- sorbent
- sorbite
- sorbose
- sordawalite
- sorting belt
- sorting plant
- slag cement
- slag pot
- slag tap
- slaggy
- slate quarry
- slate spar
- sleeve bearing
- sleeve valve
- slick
- slide caliper
- slide gage
- slide oil
- slime pulp
- slimy sapropel
- sling line
- slip cleavage
- slip grip
- slip scraper
- slop tank
- slope incline
- slot burner
- slow burning
- slow hardening
- slow oxidation
- sludging
- sluffing
- slump structure
- slurry wall
- slushing compound
- smog
- smoke cloud