When is contraction useful

Lesson Topics 1 Expansion and Contraction 2 Expansion and Contraction in Solids 3 Expansion and Contraction in Liquids 4 Expansion and Contraction in Gases Lesson Summary When a substance absorbs or loses heat energy, the movement of its particles is affected, which causes its volume to change.

Solids, liquids and gases all expand when heated, due to the increased movement of their particles. Solids, liquids and gases all contract when cooled, due to the decreased movement of their particles.

Temperature changes affect the volume of gases the most and the volume of solids the least. There are many practical and safety considerations associated with the expansion and contraction of matter due to temperature changes. Technically speaking, contractions aren't necessary in written English. Using the full version of a word is always grammatically correct. However, there are a number of reasons why contractions do serve a valuable stylistic purpose.

A couple contractions fall into the category of commonly confused words in English. Now that you have a basic understanding of how to use contractions correctly, take a look at some of the ways you could still get tripped up by contraction words. Learn when not to use an apostrophe and the 7 grammar rules you can break , including using contractions. All rights reserved. Lists of Contraction Words Contraction words are made out of common words, and there are a little over 90 standard contractions.

Using Contractions in Formal Writing While contractions can be very useful in written English, many experts caution against the use of contractions in formal communication. End of Sentence Contractions Contractions can be used in any position in a sentence; however, homophone contractions such as "it's" and "they're" sound better when followed by another word or phrase. When more people are unemployed or have their incomes cut, then less money is spent in the economy, which can further exacerbate contraction.

The longest and most painful period of contraction in modern American history was the Great Depression, from to More recently, deep contraction occurred during the early s when the Federal Reserve sent interest rates soaring to squelch inflation. This contractionary period, however, was short-lived and succeeded by a robust and sustained period of expansion.

The Great Recession of to was a period of substantial contraction spurred by an unsustainable bubble in real estate and the financial markets. Your Privacy Rights. To change or withdraw your consent choices for Investopedia. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page. These choices will be signaled globally to our partners and will not affect browsing data.

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