Dominance in genetics is a relationship between alleles of one gene, in which the effect on phenotype of one allele masks the contribution of a second allele at the same locus. The first allele is dominant and the second allele is recessive.

2 A barometer is an instrument used to measure air pressure. The barometer measures air pressure in various kinds of units including hectopascals (hPa). There are various types of barometers such as the water barometer, aneroid barometer, and the mercury barometer.

Add objects with known weights to the pan on the other side of the scale until the beam connecting the pans is level. The pans may be mounted on the beam on the beam or they may hang from the beam. Either way, the beam should become level.

Calculate the weight of all the objects that were added to the second pan. That value is the weight of the object in the first pan.

Today, the global aluminium recycling industry prevents close to 170 million tonnes of GHG from entering the environment every year.

Recycling 1 tonne of aluminium avoids the emission of about 9 tonnes of CO2 emissions – just 1 tonne of CO2 is equivalent to driving nearly 3,000 miles.

Recycling aluminium reduces the use of natural resources and chemicals (caustic soda, aluminum fluoride and lime) and eliminates the need for bauxite ore to be mined.