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Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father’s work as the supervisor of taxes in Rouen. He designed the machine to add and subtract two numbers directly and to perform multiplication and division through repeated addition or subtraction.

Blaise Pascal

Pascal’s calculatorMechanical calculatorAdding machine

The SI unit of the pressure is the pascal with the formula sign Pa. 1 Pascal is equal to the pressure of 1 newton per square meter. 1 Pa = 1 N / m2 ≡ 1 kg / m · s2. = 760 mmHg = 29.92 inHg = 14.7 lb/in2.

A pascal is a pressure of one newton per square metre, or, in SI base units, one kilogram per metre per second squared. This unit is inconveniently small for many purposes, and the kilopascal (kPa) of 1,000 newtons per square metre is more commonly used.

The pascal (pronounced pass-KAL and abbreviated Pa) is the unit of pressure or stress in the International System of Units (SI). Reduced to base units in SI, one pascal is one kilogram per meter per second squared; that is, 1 Pa = 1 kg · m-1 · s-2.

A pascal is a unit used to measure pressure. A Newton is a measure of Force (mass*gravity). When we talk about pressure, we want to know how much force is exerted on an area, and we measure that in Pascals. 1 Pascal is equal to 1 Newton over a square meter.

Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in metre-kilogram-second or SI units).

The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement. Long the dominant measurement system used in science, the SI is becoming the dominant measurement system used in international commerce.

International System of Units (SI), French Système International d’Unités, international decimal system of weights and measures derived from and extending the metric system of units.

SI units are ok interrelated in such a way that one unit is derived from other units without conversion factors. SI is used in the most places around the world, so our use of it allows scientists from disparate regions to use a single standard in communicating scientific data without vocabulary confusion.

The centimetre–gram–second system of units (abbreviated CGS or cgs) is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and the second as the unit of time.

The cgs Gaussian system is nonetheless commonly used in theoretical physics, while the MKS system (based on the meter, kilogram, and second) is commonly used in engineering and physics instruction.

The S.I. unit of mass is kilogram and of volume is cubic metre. Therefore the S.I unit of density is kg/ m 3 m^3 m3 The C.G.S. the unit of mass is gram and of volume is cubic centimetre.

Units. The SI unit of dynamic viscosity is the newton-second per square meter (N. · s/m2), also frequently expressed in the equivalent forms pascal-second (Pa.