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Before the barrel can release the bullet in a consistent manner, it must grip the bullet in a consistent manner. The part of the barrel between where the bullet exits the cartridge, and engages the rifling, is called the "throat", and the length of the throat is the freebore. In some firearms, the freebore is zero as the act of chambering the ...
The case volume or case capacity and barrel bore area can be mathematically related to obtain a case volume to bore area ratio in metric or imperial units. O r a t i o = V o l u m e c a s e A r e a b o r e {\displaystyle {O_{ratio}}={\frac {Volume_{case}}{Area_{bore}}}}
Once the bullet exits the barrel, breaking the seal, the gases are free to move past the bullet and expand in all directions. This expansion is what gives gunfire its explosive sound (in conjunction with the sonic boom of the projectile), and is often accompanied by a bright flash as the gases combine with the oxygen in the air and finish ...
The product is dead crude which is stored in stock tanks operating at just above atmospheric pressure. [3] Offshore production also produces a dead crude but is often spiked with natural gas liquids (NGL) as a convenient transport route for these liquids. This is known as live crude. The NGL is flashed off and recovered in the onshore ...
Due to the risk of confusion with the SI convention where the "M" prefix stands for "mega" representing million, the Society of Petroleum Engineers recommends in their style guide that abbreviations or prefixes M or MM are not used for barrels of oil or barrel of oil equivalent, but rather that thousands, millions or billions are spelled out. [1]
Stocks from a message board or a so-called tipsheet: There is no shortage of people offering a “hot tip” on a stock, and many of them may lurk on message boards or offer “research ...
The best brokers offer free research and a ton of resources on how to buy stocks to aid beginners. If you’re managing your own portfolio, you can also decide to invest actively or passively.
The energy conversion efficiency of a firearm strongly depends on its construction, especially on its caliber and barrel length. However, for illustration, here is the energy balance of a typical small firearm for .300 Hawk ammunition: [1] Barrel friction 2%; Projectile motion 32%; Hot gases 34%; Barrel heat 30%; Unburned propellant 1%.