A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps. Pumps operate by some
Concrete recycling is the use of rubble from demolished concrete structures. Recycling is cheaper and more ecological than trucking rubble to a landfill. Crushed rubble can be used for road gravel, revetments, retaining walls, landscaping gravel, or raw material for new concrete. Large pieces can be used as bricks or slabs, or incorporated
Welcome to the KidzSearch Encyclopedia. The safe easy-to-understand free online encyclopedia made just for kids. Featuring over 200,000 edited articles. more Click on topics below, or use search box at the top to find content. Mathematics.
Here at National Geographic Kids, we love wonderful wild bears! Join us as we learn about one of nature's cutest critters in our facts about pandas! Facts about pandas 1. Giant pandas (often referred to as simply "pandas") are black and white bears. In the wild, they
Sustainability is the idea that humans must interact with the environment in a way that ensures there will be enough resources left for future generations. There are now more than seven billion people on Earth. These billions of people use the planet's resources every day. Human activity has harmed the environment in many ways.
Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. In the past, lime based cement binders, such as lime putty, were often used but sometimes with other hydraulic cements, such as a calcium aluminate cement or with Portland cement to form Portland cement concrete (named for its visual
Wind power is an alternative energy source. This means that the power of the wind can be used in place of other energy sources such as coal, oil, and nuclear reactions . Wind can be used to produce electricity that heats homes and lights streets and buildings.
Facts about the ground are determined by drilling or boring holes for soil samples and by transmitting sound waves and electric currents through the soil. Foundation piles, long columns usually made of steel or creosote-impregnated poles, are pounded deep into the ground by pile drivers.
Kids Encyclopedia Facts. Heavy equipment are heavy-duty vehicles. They are specially designed for completing construction tasks involving digging. Other known names for heavy equipment are heavy machines, heavy trucks, construction equipment, engineering equipment, heavy vehicles, or heavy hydraulics. They are typically operated by skilled workers
National Geographic Kids is an exciting monthly read for planet-passionate boys and girls, aged 6-13! Packed full of fun features, jaw-dropping facts and awe-inspiring photos – it'll keep you entertained for hours! Find our magazine in all good newsagents, or become
Explore the nine (or eight) planets of our solar system with easy-to-understand information for kids. The Nine Planets has been online since 1994 and was one of the first multimedia websites that appeared on the World Wide Web. Take an interactive tour of the solar
The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen to every cell. After delivering the oxygen, the blood returns to the heart. The heart then sends the blood to the lungs to pick up more oxygen. This cycle repeats over and over again.
The ancient city of Rome was the center of one of the largest and most powerful empires the world has ever seen. The Roman Empire was based in what is now Italy . As the Roman Empire took over more land and peoples, its influence spread throughout western Europe and into all the lands around the Mediterranean Sea . The achievements of the
Pick up ten facts you wouldn't believe about LEGO right here at NG Kids - the history of this top toy, the height of the tallest LEGO tower, how many blocks are produced each
6/7/2021 · The first effective air pump constructed in England for scientific purposes was made in 1658 by Robert Hooke for Robert Boyle. Pumps and compressors use very similar mechanisms, and basically perform the same action, but in different fluid regimes.
Lonnie JohnsonLonnie George Johnson (1949-) is an inventor, engineer, and scientist from Mobile, Mobile County. Johnson had a distinguished engineering career with the U.S. Department of Energy's Oak Ridge National Laboratory, the National Aeronautics and Space Administration, and the U.S. Air Force before devoting himself full-time to inventing. Johnson holds more than 100 patents but is
On the night of August 12–13, 1961, the East Germans built a barrier of barbed wire and cinder blocks. They later built a more permanent structure of concrete walls topped with barbed wire. The wall was up to 15 feet (5 meters) high in some places. In other
16/7/2021 · Kids Encyclopedia Facts Hadrian 's Pantheon in Rome is an example of Roman concrete construction. Outer view of the Roman Pantheon, still the largest (43.4m dia.) unreinforced solid concrete dome. A modern building: Boston City Hall …