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They were invented in the 1950's to assist polio victims in breathing when their respiratory muscles became paralyzed.
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∙ 14y ago
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What is the past tense and the past participle of iron?
The past tense of "iron" is "ironed." The past participle of "iron" is also "ironed."
What was iron used for in the past?
Like..... Making tools and armor and stuff
How was the element iron used in the past?
In the iron age iron was used to make useful tools that they made easier, more complex, sometimes more hard and resistant than the stones tools of the stone age.
What does iron help you with?
Iron makes up part of the haemoglobin molecule which is oxidised in the lungs when it is exposed to air. Iron turns red when it oxidises (rusts) that's why blood in most arteries away from your lungs is red, and blue on it's return. Oxygen is used in chemical reactions in your mitochondria in your cells that produce energy to run your body.
What did the bicycle improve upon?
In the past they used to have iron and wood wheels. Know we have rubber wheels
What is the past tense of iron?
The past tense is ironed.
What is the past participle of iron?
Ironed.
What has iron been used for in the past?
Soutullo? If you don't know what I'm talking about, never mind. Weapons, weapons weapons!
What kind of metal did the blacksmith use?
In past times most often the blacksmith used wrought iron. Wrought iron is made by taking iron ore and charcoal heating until it melts. That process produces pig iron. The next step is to heat the pig iron up until it is soft then hammer it until most of the impurities are driven off. Iron as it is heated past 600 degrees F turns black as the iron oxides with air. That gives the Blacksmith his name black + smith or striker. Mild steel is used for most modern blacksmith works.Mild steel that is steel that has less than .3 percent carbon in it. Cast iron is not used as it is too brittle.
Is iron ore dangerous to people?
yes it can get into your lungs and cause lung cancer
What does the iron lungs perk do in Call of Duty 4 Modern Warfare?
The "iron lungs" perk in Call of Duty 4: Modern Warfare, will make you hold your breath for a longer time, while you are using a sniper rifle.
What is the simple past tense of iron?
ironed
