A spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ such as a heart, or a similarly sudden contraction of an orifice.It most commonly refers to a muscle cramp which is often accompanied by a sudden burst of pain, but is usually harmless and ceases after a few minutes. spasm is a sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ such as a heart, or a similarly sudden contraction of an orifice.
Top 10 largest Cement Producing Countries in the World. China has the first stage in the list of cement producing countries. They produce more than 2482 million tonnes. It is mainly used for construction and china is highly populated.
This article summarizes the world steel production by country. In 2015, total world crude steel production was 1,599.5 million metric tonnes (mmt). The biggest steel producing country is currently China, which accounted for 50.3% of world steel production in 2015. In 2008 and 2009, output fell in the majority of steel-producing countries as a result of the global recession.