Higher heating value: the energy released from the combustion of a fuel that includes the latent heat of water.

Host rock

In geology, the rock formation that contains a foreign material. Hybrid vehicle

Vehicle that combines a fossil fuel internal combustion engine and an alternative energy source, typically batteries.


An ice-like compound formed by the reaction of water and CO2, CH4 or similar gases.

Hydrodynamic trap

A geological structure in which fluids are retained by low levels of porosity in the surrounding rocks.


Concerning water in the geological environment. Hydrostatic

Pertaining to the properties of a stationary body of water. Hypercapnia

Excessively high CO2 levels in the blood. Hypoxia

Having low rates of oxygen transfer in living tissue. Hysteresis

The phenomenon of a lagging recovery from deformation or other disturbance.

Guide to Alternative Fuels

Guide to Alternative Fuels

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