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What does UHC stand for?

UHC stands for Unburned Hydrocarbons

This definition appears frequently and is found in the following Acronym Finder categories:

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We have 80 other meanings of UHC in our Acronym Attic

Samples in periodicals archive:

Subsequent research by more than a dozen different laboratories has confirmed that "airtight" woodstoves emit larger amounts of carbon monoxide, particulates, and unburned hydrocarbons than do old-fashioned wood-burners.
The use of biodiesel in conventional diesel engines results in substantial reduction of unburned hydrocarbons, carbon monoxide, and particulate matter compared to emissions from petroleum-based diesel fuel.
Gas grills are fueled by either natural gas or propane, both of which give off carbon monoxide, carbon dioxide, nitrogen oxides, particulate matter, and unburned hydrocarbons that form air pollution.
According to EnviroFuels, verification tests of the company's DFC conducted with a locomotive revealed improvements in fuel consumption of five to 10 percent, with "significant" reductions in total unburned hydrocarbons (THC) nitrogen oxides (NOx), carbon dioxide (CO2) and carbon monoxide (CO) emissions.
Environmental Protection Agency analyzed the emissions of a 20% biodiesel/ 80% petroleum diesel blend and found reduced emissions of particulate matter (-12%), unburned hydrocarbons (-20%), and carbon monoxide (-12%).
Introducing only 20 percent biodiesel into the problem diesel supply we use in our conventional diesel engines will result in a substantial reduction of unburned hydrocarbons, carbon monoxide and particulate matter compared to emissions from regular diesel fuel.