Most of these gases are heavier than air because of their molecular weight or due to the low temperature which they would take on in the event of an accidentally caused release. In consequence, the dispersion of them cannot be calculated by conventional techniques which were developed for ...
百度试题 结果1 题目 重于空气的气体或蒸气是指相对密度大于()的气体或蒸气Gases or vapors heavier than air are those with a relative density greater than () A. 1.0 B. 1.2 C. 1.5 D. 2.0 相关知识点: 试题来源: 解析 B 反馈 收藏 ...
To prepare for their flight at Kitty Hawk, the Wright brothers studied the movements of pigeons to figure out how they stayed high up when they were heavier than air. Their success inspired scores of successors to improve on the airplane by studying various aspects of nature. One of Orville ...
The gases that experts suspect are in the area are heavier than air, which means they could be sitting in low-lying areas if not completely dissipated. National Guard members wearing protective gear are taking readings inside homes, basements and businesses, Major General John Harris Jr. sa...
Unfortunately it's explicitely specified as an air rating instead, so we must somehow convert that into a water-vapor rating by considering the different diffusion properties of air and water vapor... If we assume that most pores in the mortar are much larger than the dimensions of the ...
LPG is a colorless, odorless and non-toxic gas. It is highly flammable. The vapors of LPG are heavier than air, so any leaks will sink to the ground and accumulate in low-lying areas where they are difficult to dissipate. lpg expands rapidly when the temperature rises. ...
when in contact with air, water or other materials may react in a dangerous and violent manner. Dangerous reactions are those emitting heat, and those that generate hazardous vapours and gases. A reaction which produces heat is called an exothermic reaction. The speed of a reaction varies widely...
Why is the density of a gas much lower than that of a liquid or solid under atmospheric conditions?In general, most substances are: A.) least dense in the liquid state. B.) more dense as gases than as solids C.) less dense as solids than as liq...
Many properties of the gases in the atmosphere are dependent on the altitude at which they are found. For instance, average density of these gases generally decrease as one rises to higher altitudes. As a result, the pressure (being due to the collisions of the particles that make up the ...
As a consequence of the high catalytic activity, palladium membranes thicker than ∼10 μm are diffusion limited, that is, the rate at which hydrogen can dissolve into or out of the membrane is greater than the rate at which hydrogen can diffuse across the membrane. The hydrogen permeability...