In physics, the meter water equivalent (often m.w.e. or mwe) is a standard measure of cosmic ray attenuation in underground laboratories. A laboratory at a depth of 1000 m.w.e is shielded from cosmic rays equivalently to a lab 1,000 m (3,300 ft) below the surface of a body of water. Because laboratories at the same depth (in meters) can have greatly varied levels of cosmic ray penetration, the m.w.e. provides a convenient and consistent way of comparing cosmic ray levels in different underground locations. Cosmic ray attenuation is dependent on the density of the material of the overburden, so the m.w.e. is defined as the product of depth and density (also known as an interaction depth). Because the density of water is 1 g/cm3, 1 m (100 cm) of water gives an interaction depth of 1 hectogram per square centimetre (100 g/cm2). Some publications use hg/cm² instead of m.w.e., although the two units are equivalent. For example, the Waste Isolation Pilot Plant, located 660 m (2,170 ft) deep in a salt formation, achieves 1585 m.w.e. shielding. Soudan Mine, at 713 m (2,339 ft) depth is only 8% deeper, but because it is in denser iron-rich rock it achieves 2100 m.w.e. shielding, 32% more. Another factor that must be accounted for is the shape of the overburden. While some laboratories are located beneath a flat ground surface, many are located in tunnels in mountains. Thus, the distance to the surface in directions other than straight up is less than it would be assuming a flat surface. This can increase the muon flux by a factor of 4±2. The usual conversion between m.w.e. and total muon flux is given by Mei and Hime: Where is the depth in m.w.e. and is the total muon flux per cm2⋅s. (The first term dominates for depths up to 1681.5 m.w.e.; below that, the second term dominates. Thus, for great depths, the factor of 4 mentioned above corresponds to a difference of 698 ln 4 ≈ 968 m.w.e.) (Wikipedia).
Examples: Converting Between Metric Units
This video provides several examples of converting between different metric units of measure.
From playlist Unit Conversions: Metric Units
This video explains how to convert to different metric units of measure for length, capacity, and mass. http://mathispower4u.wordpress.com/
From playlist Unit Conversions: Metric Units
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The international base unit of length, accepted as the world wide standard, but where did it come from, who decided and how exactly is it defined.
From playlist Units of measurement
using proportions to convert between liters and milliliters
From playlist Common Core Standards - 7th Grade (Part 2)
Ex: Metric Conversions Using Unit Fractions - Length
This video provides three examples of how to perform metric conversions involving length using unit fractions. Site: http://mathispower4u.com Blog: http://mathispower4u.wordpress.com
From playlist Unit Conversions: Metric Units
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Visit http://ilectureonline.com for more math and science lectures! In this video I will convert cubic centimeters to liters, yards to meters, square centimeters to square meters, and gallons to liters. Next video in the series can be seen at: http://youtu.be/GBv_JLUzM-M
From playlist Michel van Biezen: Physics Mechanics 1: Introduction, Standard Units, and Vectors
Examples: Convert Volume Between the Standard and Metric System
This video provides examples of converting volume or capacity between the Standard and Metric Systems. Complete Video List: http://www.mathispower4u.com
From playlist Unit Conversions: Converting Between Standard and Metric Units
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Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to callulate how many gal/min a 2.5hp pump can pump water up an 18m well.
From playlist PHYSICS - MECHANICS
Thermodynamics: Mechanical Equivalent of Heat
The mechanical equivalent of heat is the idea that motion and heat are interchangeable. When a certain amount of work is done it can generate an equivalent amount of heat, as long as the work done is completely converted to heat energy. The mechanical equivalent of heat was important in th
From playlist Thermal Physics/Fluid Mechanics
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Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the mechanical equivalence of heat.
From playlist PHYSICS - THERMODYNAMICS
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This video explains to convert between meters and feet using a unit fraction. http://mathispower4u.com
From playlist Unit Conversions: Converting Between Standard and Metric Units
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Visit http://ilectureonline.com for more math and science lectures! In this video I will calculate the volume of Venus' atmosphere by converting it to water and calculate how deep would Venus' “water” atmosphere would be on Earth. Next video in this series can be seen at: https://youtu.b
From playlist THE "HOW IS" PLAYLIST
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From playlist IIT Madras: Introduction to Atmospheric Science | CosmoLearning.org
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From playlist Iconic Builds
The Burj Khalifa: The World's Tallest Building
Burj Khalifa is known for being the tallest building in the world, standing at 2,717 feet (828 m). Being architecture royalty, the tower has an ionic telescopic spire and the world’s highest outdoor observation deck. According to reports, 12,000 builders and contractors worked on the pr
From playlist Iconic Builds
How Engineers Construct Cruise Ships [4K] | Extreme Constructions | Spark
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From playlist 4K Science Documentaries
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People have labored on some gigantic undertakings such as roads, bridges, and canals that link oceans. these feats of engineering have allowed cities to grow, but now they are also allowing us to travel into space. -- Many of mankind's ideas to build big seem impossible. It's an inescapab
From playlist Supersized Structures
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From playlist New AP & General Chemistry Video Playlist
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From playlist Special Events and Livestreams
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Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the velocity of sound (in water).
From playlist PHYSICS MECHANICS 5: WAVES, SOUND