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Its precise nature is currently a mystery, although its effects can reasonably be modeled by assigning matter-like properties such as energy density and pressure to the vacuum itself. [65] [66] Fully 70% of the matter density in the universe appears to be in the form of dark energy. Twenty-six percent is dark matter. Only 4% is ordinary matter.
In regular cold matter, quarks, fundamental particles of nuclear matter, are confined by the strong force into hadrons that consist of 2–4 quarks, such as protons and neutrons. Quark matter or quantum chromodynamical (QCD) matter is a group of phases where the strong force is overcome and quarks are deconfined and free to move.
Science Buddies also provides resources to support parents and teachers as they guide students seeking out and performing science projects. They attempt to provide a bridge between scientists, engineers, educators, and students, giving students access to current scientific research and simultaneously giving scientists a way to reach out to ...
A science fair or engineering fair is an event hosted by a school that offers students the opportunity to experience the practices of science and engineering for themselves. In the United States, the Next Generation Science Standards makes experiencing the practices of science and engineering one of the three pillars of science education.
A science project is an educational activity for students involving experiments or construction of models in one of the science disciplines. Students may present their science project at a science fair, so they may also call it a science fair project. Science projects may be classified into four main types.
The group 4 project (10 hours, 6 raw marks). Candidates will need to complete an interdisciplinary project with other science students. This is marked against the personal skills criterion. Both components carry a weightage of 30% (SL) or 20% (HL) of the computer science course.
After extended litigation, in 2000, a Canadian court permitted issuance of a patent on a mouse as a "composition of matter." [14] However, in 2002, the Canadian Supreme Court reversed that ruling and held (5-4) that the mouse itself could not be patented, but the biochemical process used to modify it could be. [15]
The characteristic properties of a substance are always the same whether the sample being observed is large or small. Thus, conversely, if the property of a substance changes as the sample size changes, that property is not a characteristic property. Examples of physical properties that aren't characteristic properties are mass and volume.
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