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# Now complete the definitions (1-11) below with the units from exercise 2 and the people from the box

 Andrè Marie Ampère (1775-1836) Anders Celsius (1701-1744) Marie Curie (1867-1934) Heinrich Hertz (1857-1894) James Prescott Joule (1818-1889) Lord Kelvin (1824-1907) Georg Simon Ohm (1787-1854) Blaise Pascal (1623-1662) Sir Isaac Newton (1643-1727) Count Alessandro Volta (1745-1827) James Watt (1736-1819)
 1 A ___ is a unit of pressure equal to one Newton per square metre. It's named after ___ , a French scientist. 2 A ___ is a unit of force. It's named after ___ , an English mathematician. 3 ___ is the temperature scale that has the freezing point of water as 0°C and the boiling point as 100°C. The scale was developed by a Swedish astronomer, ___ . 4 A ___ is an amount of electric power. It is equal to one joule per second. It's named after ___ , a Scottish engineer and inventor. 5 A ___ is a unit of electric force. It's named after ___ , an Italian physicist and pioneer in the study of electricity. 6 An ___ is a unit of electric current. It's named after ___ , a French mathematician and physicist, a pioneer in electrodynamics. 7 An ___ is a unit of electrical resistance named after ___ , a German physicist. 8 A ___ is a unit of energy named after ___ , a British physicist. 9 ___ is the temperature scale that registers absolute zero (-273.15C) as 0°K. It's named after ___, a British scientist. 10 A ___ is a frequency equal to one cycle per second. It's named after ___ , a German physicist. 11 A ___ is a unit of radioactivity. It's named after ___ , a Polish-born chemist who discovered radioactivity in several elements.

4. Read the sentences from exercise 3 again and find the words that mean:

 1 A person who studies the elements and their compounds. 2 A person who studies the universe. 3 A person who studies the physical properties of materials. 4 A person who thinks of new machines. 5 A person who develops new ideas about a subject.

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