Questions

A filament is a metal wire that glows when electricity is channeled into it. The filament of an electric bulb is made of Tunsten. 

Because of its high melting point and its greatest tensile strength, it makes for a good filament in light bulbs.

The 2019 BRICS summit is the eleventh annual BRICS summit, an international relations conference attended by the heads of state or heads of government of the five-memberstates Brazil, Russia, India, China and South Africa. The summit will be held in Rio de Janeiro, Brazil, the third time Brazil has hosted the summit after the 2014 summit.

When water freezes its density decreases.

Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances. But at about 4°C it reaches a maximum density and then decreases in density as it approaches the freezing point.