Why are blueberries sour?

A common cause of sour blueberry fruit is over-production on a bush. If your bush is newly planted, you'll get sweeter, bigger berries if you remove all blossoms for the first year or two to allow the root system to establish. ... If blueberries are sour when picked, they will remain so.

Explanation:

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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