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V. Reading Comprehension (6%; 2% each) When a mass of solid flammable material is heated it burns away slowly owing to the limited surface area exposed to the oxygen of the air. The energy produced is liberated gradually and harmlessly because it is dissipated as quickly as it is released. The result is quite different if the same mass of material is grounded to a fine powder and intimately mixed with air in the form of a dust cloud. In these conditions the surface area exposed to the air is very great and if ignition now occurs, the whole of the material will burn with great rapidity; the energy, which in the case of the mass was liberated gradually and harmlessly, is now released suddenly with the evolution of large quantities of heat and, as a rule, gaseous reaction products. Although an intimate mixture of a flammable dust and air may burn with explosive violence, not all mixtures will do so. There is a range of concentrations of the dust and air within which the mixture can explode, but mixtures above or below this range cannot. The lowest concentration of dust capable of exploding is referred to as the lower explosive limit and the concentration above which an explosion will not take place as the upper explosive limit. The lower explosive limits of many materials have been measured. They vary from 10 grams per cubic metre to about 500 grams per cubic metre. For most practical purposes it may be assumed that 30 grams per cubic metre is the lower explosive limit for most flammable dusts. Though this may seem to be a very low concentration, in appearance a cloud of dust of such a concentration would resemble a very dense fog. The upper explosive limits are not well defined and have poor repeatability under laboratory test conditions. Since the upper explosive limit is of little practical importance, data for this parameter is rarely available. The most violent explosions are produced when the proportion of oxygen present is not far removed from that which will result in complete combustion. The range of the explosive concentrations of a dust cloud is not simply a function of the chemical composition of the dust; the limits vary with the size and shape of the particles in the dust cloud The heat produced by the combustion of the dust particles in a dust explosion and any gases evolved will cause a rapid increase in pressure at the walls of the vessel containing the dust cloud. In factories it is the effect of this pressure wave on relatively weak items of plant and buildings which has caused the deaths and injuries to persons employed in handling materials giving rise to dust explosions. Further, since the pressure wave produced by the explosion can cause further dust which may have accumulated in the plant or on internal surfaces of buildings to be thrown into suspension in air, additional fuel can be fed to the flame and a disastrous secondary explosion may follow. Additional consequences following a dust explosion pressure wave are: the fires that may have been started by the dust flame; the implosion effect on the plant and buildings as the pressure within these rapidly returns to normal.
【題組】50. What could be the best title for this article?
(A) How to Prevent Dust Explosions
(B) Dust Explosions—the Basics
(C) What We Have Learned from Dust Explosions
(D) A Tragic Incident Caused by Dust Explosions

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難度： 適中
1F
祝大家順利上榜! 國二上 (2016/05/02)
為什麼不能選C?
這個題組真的是有夠難的==
2F
112應屆上榜 ๑•̀ • 大三下 (2023/05/19)
當大量可燃固體物質加熱時，由於暴露在空氣中的氧氣面積有限，它會慢慢燃燒殆盡。所產生的能量逐漸且安全地釋放，因為它被迅速消散。如果將相同的物質粉碎成細粉並與空氣混合成塵雲狀態，結果就會完全不同。在這種情況下，暴露在空氣中的表面積非常大，如果此時發生點燃，整個物質將迅速燃燒；能量，原本是逐漸且安全釋放的，現在突然釋放出大量的熱能，通常還伴隨著產生大量的氣體反應產物。雖然可燃性粉塵和空氣的緊密混合物可能會引起爆炸性爆炸，但並非所有的混合物都會如此。可燃性粉塵和空氣之間存在一個爆炸範圍的濃度，而在此範圍之上或之下的混合物則無法發生爆炸。最低的能夠發生爆炸的粉塵濃度被稱為下爆炸極限，而在此濃度之上不會發...
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V. Reading Comprehension (6%; 2% each) ..-阿摩線上測驗