- hardness scale
- harmaline
- harmless refrigerant
- harness oil
- hastelloy
- haulage
- haulage level
- haulage plane
- haulage tunnel
- hausmannite
- hazard
- head
- head capstan
- head product
- header
- header tank
- heat erosion
- heat exchange
- heat exchanger
- heat expansion
- heat generation
- heat index
- heat loss
- heat plug
- heat prover
- heat seal
- heat sensitivity
- heat test
- heat tint
- heat waste
- heat-tinting
- heated plate
- heater test
- heater treater
- hawser
- hazardous substances
- hazelnut oil
- hazy
- hdroxynaphthoquinone
- head flume
- head pulley
- header box
- headframe
- headgate
- heading machine
- headlight oil
- headwater
- headwind
- healing gas
- heap sand
- heap up
- heart cut
- heat ageing
- heat aging
- heat conductibility
- heat consumption
- heat control
- heat cure
- heat density
- heat elimination
- heating agent
- heating capacity
- heating coke
- heating curve
- heating element
- heating init
- heating jacket
- heating method
- heating oil
- heating period
- heating pipe
- heating power
- heating surface
- heating system
- heating time
- heating value
- heating water
- heating zone
- heave
- heaving shale
- heavy alkylate
- heavy barite
- heavy crude
- heavy current
- heavy cut
- heavy dirt
- heavy end
- heavy fuel
- heavy gradient
- heavy ice
- heavy layer
- heavy liquid
- heavy mineral
- heavy plates
- heavy residue
- heavy scale
- heavy section
- heavy water
- Hefner lamp
- heft