One hectare comprises between 1.2 and 1.6 football pitches, as soccer fields are known in British English. An internationally-sanctioned soccer field is 100 to 110 meters in length by 64 to 75 meters in width, comprising between 0.62 and 0.82 hectares depending on the field. Keep Learning.
From Wikipedia, the free encyclopedia. Alkaliâaggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non-crystalline silicon dioxide, which is found in many common aggregates.he alkaliâaggregate reaction is a general, but relatively vague, expression which can lead to confusion. More precise definitions include the following: 1  Alkaliâsilica reaction (ASR, the most common reaction of this type); 2  Alkaliâsilicate reaction, and; 3  Alkaliâcarbonate reaction.
DO NOT TRY THIS! Alkali Metals react with water to produce that metal's hydroxide and liberate Hydrogen Gas. As we move down the Alkaline Metal group (Group 1) in periodic table, reactions become more vigorous and sometimes Hydrogen ignites and explodes.This video has some clips of explosion.Also Francium Bomb in water!lkali Metals react with water to produce that metal's hydroxide and liberate Hydrogen Gas. As we move down the Alkaline Metal group (Group 1) in periodic table, reactions become more vigorous and sometimes Hydrogen ignites and explodes. This video has some clips of explosion. Also Francium Bomb in water!