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- 1: Units and Measurement
- Dimensions of Physical Quantities
- 1.3 The Language of Physics: Physical Quantities and Units

*The thumbnail image is of the Whirlpool Galaxy, which we examine in the first section of this chapter. Galaxies are as immense as atoms are small, yet the same laws of physics describe both, along with all the rest of nature—an indication of the underlying unity in the universe.*

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In order to be able to give an answer, we need certain measurable quantities as input - in the present case, the mass of the box and the height of a floor. Then, using our laws of physics, we will be able to produce another measurable quantity as our answer - here the amount of work needed. Of course, you could check this answer, and thus validate our physical model of reality, by measuring the quantity in question. The term we use to express this is, rather unfortunately, to say that physical quantities have a dimension - not to be confused with length, height and width. Anything that has a dimension can be measured, and to do so we use units - though there may be different units in which we measure the same quantity, such as centimeters and inches for length. When measuring the same quantity in different units, you can always convert between them - there are 2. We will encounter only three different basic quantities, which have the dimensions of length L , time T , and mass M.

In engineering and science , dimensional analysis is the analysis of the relationships between different physical quantities by identifying their base quantities such as length , mass , time , and electric charge and units of measure such as miles vs. The conversion of units from one dimensional unit to another is often easier within the metric or SI system than in others, due to the regular base in all units. Dimensional analysis, or more specifically the factor-label method , also known as the unit-factor method , is a widely used technique for such conversions using the rules of algebra. Commensurable physical quantities are of the same kind and have the same dimension, and can be directly compared to each other, even if they are originally expressed in differing units of measure, e. Incommensurable physical quantities are of different kinds and have different dimensions, and can not be directly compared to each other, no matter what units they are originally expressed in, e. For example, asking whether a kilogram is larger than an hour is meaningless. Any physically meaningful equation , or inequality , must have the same dimensions on its left and right sides, a property known as dimensional homogeneity.

Physics is a quantitative science, based on measurement of physical quantities. Certain physical quantities have been chosen as fundamental or base quantities. The fundamental quantities that are chosen are Length, Mass, Time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. Each base quantity is defined in terms of a certain basic arbitrarily chosenbut properly standardised reference standard called unit such as metre,kilogram,second,ampere,kelvin,mole,and candela. The units for the fundamental base quantities are called fundamental or base units and two supplementary units in relation to quantities plane angle and solid angle radian, Ste radian.. Other physical quantities derived from the base quantities can be expressed as a combination of the base units and are called derived units. A complete set of units both fundamental and derived units are called a system of units.

The base units for length, mass and time in these systems were as follows: PHYSICS. Table Range and order of masses. MEASUREMENT OF TIME. To measure any time temperature, voltage supply, mechanical vibrations of.

A physical quantity is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as the combination of a numerical value and a unit. For example, the physical quantity mass can be quantified as n kg , where n is the numerical value and kg is the unit. A physical quantity possesses at least two characteristics in common, one is numerical magnitude and other is the unit in which it is measured.

*Physicists, like other scientists, make observations and ask basic questions. For example, how big is an object?*

Можешь представить себе последствия, если бы это обнаружилось, когда Попрыгунчик был бы уже внедрен. - Так или иначе, - парировала Сьюзан, - теперь мы имеем параноиков из Фонда электронных границ, уверенных, что черный ход есть во всех наших алгоритмах. - А это не так? - язвительно заметил Хейл. Сьюзан холодно на него посмотрела. - Да будет. - Хейл вроде бы затрубил отбой. - Теперь это не имеет значения.

О Боже, я вам так благодарна. Беккер растерялся. Очевидно, он ошибался. Девушка обвила его руками. - Это лето было такое ужасное, - говорила она, чуть не плача.

Я хотел внести исправления тихо и спокойно. Изначальный план состоял в том, чтобы сделать это незаметно и позволить Танкадо продать пароль. Сьюзан должна была признать, что прозвучало это довольно убедительно. У Танкадо не было причин подозревать, что код в Интернете не является оригиналом. Никто не имел к нему доступа, кроме него самого и Северной Дакоты.

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## 5 Comments

## Arienne R.

It is must to measure all Physical quantities so that we can use them. In this chapter we the dimension and dependence of the unit of any Physical quantity on fundamental quantities or unit. derive formula if in mechanics a physical quantity.

## Nancy G.

Figure 1.

## Babbete S.

In this article, we shall study the concept of dimensions of physical quantities and to find dimensions of given physical quantity.

## Tameka B.

Measurements. Basis of testing theories in science. Need to have consistent systems of units for the measurements. Need rules for dealing with the uncertainties.

## Walter E.

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