Hydroelectric power generates electricity with the energy of moving water, which is considered a renewable resource. Used for millennia...

Volatile organic compounds (VOCs) evaporate or vaporize easily at room temperature, diffusing into the air we breathe. They transition...

NOx are nitrogen compounds, mainly nitric oxide (NO) and nitrogen dioxide (NO2). These gases create serious environmental problems,...

Vehicle emissions are the waste material of combustion, including gases and particulate matter (PM). With more than 1.4 billion vehicles...

Ethanol, also known as ethyl alcohol , is a clear, flammable liquid with a wine-like odor. It's produced by microbial fermentation of...

Biofuels, made from organic materials, promise a renewable alternative to fossil fuels. While the sunny side of biofuel touts its...

Nuclear energy uses the power of the atom, the fundamental constituent of matter. Atomic energy is released through nuclear fission or...

Lithium-ion batteries power many aspects of life including smartphones and electric vehicles. With rapid market growth comes the question...

Gravity influences ocean tides and shapes the weather patterns. It attracts objects toward one another, causing swollen seas, cloud...

Clean rooms are specialized environments to minimize contaminants like dust, microbes and other particles. They're perfectly controlled...

Space aerosols are natural particles active in the atmosphere of Earth. They affect weather patterns, health and ecological balance. Some...

Spacecraft re-entry in the atmosphere has consequences. Many survive intense heat and friction through ablation, drawing heat away from...

The Great Pacific Garbage Patch (GPGP) is in the central North Pacific Ocean. A massive moving marine dump, it accumulates vast amounts...

The Spacecraft graveyard or cemetery in the South Pacific is a disposal site for spacecraft at the end of their lives. Mir space station...

The Gaza Strip is a narrow territory bordering Israel, Egypt and the Mediterranean Sea. It's one of the most densely populated areas in...

Crude oil and natural gas are often found together in nature, both developing from the same process over millennia. Important energy...

Iran has a critical and often controversial position on the world stage. In the eastern Middle East, Iran is a primarily Muslim country...

Extreme heat is a pressing reality for many parts of the world. Hazardous temperatures bring exhaustion, breathing problems, heatstroke,...

Heat is neutral. It can nurture or kill. With rising temperatures, many world regions already reach lethal levels. Extreme heat is...

Wind turbines use renewable energy, the power of the wind. They transform wind force into electricity. The process is built upon...