PHYS - LONG QUIZ

measurement

it is a process of assigning a quantity to describe a property of an object by comparing it with a standard

international system

it is the standard system of measurement for the fundamental quantities abbreviated from systeme international

second

the time required for 9 192 631 770 cycles of microwave radiation in cesium-133 atoms

meter

the distance traveled by light in a vacuum in 1/299 792 458 second

kilogram

was redefined in may 2019

redefined by taking the fixed numerical value of the planck constant h to be 6.626 070 15×10^-34 when expressed in the unit J s, which is equal to kg m2 s-1

ampere

defined by taking the fixed numerical charge e to be 1.602 176 634×10^-19 when expressed in the unit C

kelvin

defined by taking the fixed numerical value boltzmann constant k to be 1.380 649×10^-23

mole

it contains exactly 6.022 140 76 ×10²³ elementary entities

candela

defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation with frequency of 540×10^12 Hz

british imperial system

it was established from the weights and measures act of 1824 and was continuously reformed

scientific notation

sometimes called powers-of-10-notation

significant figures

is a reliably known digit

is characterized by the fewest digits used in reporting values without losing accuracy