Australia is 2.8 times larger than Argentina.
Area: 2,780,400 km2 World Factbook
Population: 43,024,374 (July 2014) World Factbook
Argentina, officially the Argentine Republic is a federal republic located in southeastern South America. Wikipedia
Area: 7,741,220 km2 World Factbook
Population: 22,507,617 (July 2014) World Factbook
Australia, officially the Commonwealth of Australia, is a country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. It is the world's sixth-largest country by total area. Wikipedia