In this course, we will mainly use five of these: length, mass, time, electric current and temperature.The units in which they are measured are the meter, kilogram, second, ampere, kelvin, mole, and candela (Table 1.1).
Venn diagram of science: Top line: Physics Middle row: Biophysics, Science, Physical chemistry Bottom Row: Biology, Biochemistry, Chemistry by Wikipedia.
Physicists, like other scientists, make observations and ask basic questions. For example, the length of a race, which is a physical quantity, can be expressed in meters (for sprinters) or kilometers (for long distance runners).
PHYSICAL SCIENCE OF CHEMISTRYChemistry is a branch of physical science that studies the composition, structure, properties and chance of matter.
Chemistry is chiefly concerned with atoms and molecules and their interaction and transformations.
The life starts and ends with chemistry for good example.
Even NASA SCIENTISTS depending on chemistry analysis to find out the mars planet study.
In 1983, the meter was given its present definition as the distance light travels in a vacuum in 1/ 299,792,458 of a second (Figure 1.14). It is defined to be the mass of a platinum-iridium cylinder, housed at the International Bureau of Weights and Measures near Paris.
Exact replicas of the standard kilogram cylinder are kept in numerous locations throughout the world, such as the National Institute of Standards and Technology in Gaithersburg, Maryland.
The definition of the meter has changed over time to become more accurate and precise.
The meter was first defined in 1791 as 1/10,000,000 of the distance from the equator to the North Pole.