Liquids such as petroleum are pumped through pipelines or carried in vessels called tankers.
As a result, many light green ethical funds can invest in industries that dark green funds wouldn't touch with a barge poll, such as petroleum.
Its export sector still relies heavily on low-tech goods, such as petroleum products (the country has a number of large refineries), food and beverages, and textiles.
"Many of our courses, such as petroleum engineering and chemical engineering, are designed for particular industries, and we have links with industry in Scotland.
Scientists made advances in the study of hydrogen bonds, the use of sunlight and water for generating hydrogen gas, and the detection of water pollutants such as petroleum.
Some lubricants, such as petroleum derivatives, are available in a great range of viscosities and thus can satisfy a broad spectrum of functional requirements.
Greases of mineral or synthetic origin consist of a thickening agent dispersed in a liquid lubricant such as petroleum oil or a synthetic fluid.
Since such materials can be replenished readily, biofuels are a renewable source of energy, unlike fossil fuels, such as petroleum, coal, and natural gas.
Since such feedstock material can be replenished readily, biofuel is considered to be a source of renewable energy, unlike fossil fuels such as petroleum, coal, and natural gas.
Ships – particularly those carrying refined products that are easy for robbers to sell quickly, such as petroleum – should follow certain basic tactics when entering a port.
Although originally designed to locate natural earthquakes, seismographs have many other uses, such as petroleum exploration, investigation of Earth's crust and lower layers, and monitoring of volcanic activity.
