cho khối lượng mol của nguyên tử H là 1,008g. Biết 1 mol H có 6,023.1023 hạt vi mô. Tính khối lượng của 1 nguyên tử H

An observation that requires measurement is called quantitative observable or qualitative

Stage in which a typical star has completely stopped fusion

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.