The mass per unit volume of a substance is called density.
(density = mass/volume).
Arrange the following in order of
increasing density – air, exhaust
from chimneys, honey, water,
chalk, cotton and iron.

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.