Physical world and measurement is an important topic in the NEET Chemistry syllabus. It deals with the fundamental concepts of measurement, units, and dimensions. The topic is important because it provides the basis for all scientific experiments and measurements. Here are some of the key concepts related to Physical world and measurement:

1. Units and dimensions: The SI system of units is used in all scientific measurements. The system is based on seven base units that are used to derive all other units. The dimensions of physical quantities are expressed in terms of these units.
2. Accuracy and precision: Accuracy refers to how close a measurement is to the true value of the quantity being measured. Precision refers to how closely repeated measurements of the same quantity agree with each other.
3. Significant figures: In scientific measurements, it is important to report the results with the appropriate number of significant figures. This refers to the number of digits in a measurement that are known with certainty.
4. Error analysis: All measurements are subject to errors. Error analysis is the process of determining the accuracy and precision of a measurement and the sources of errors that may affect the measurement.
5. Dimensions of physical quantities: Physical quantities have dimensions, which are expressed in terms of the fundamental units. For example, the dimension of length is expressed in terms of the fundamental unit of length, which is the meter.
6. Dimensional analysis: Dimensional analysis is a useful tool for checking the consistency of equations and for deriving relationships between physical quantities. It involves comparing the dimensions of physical quantities on both sides of an equation.

Overall, a strong understanding of Physical world and measurement is essential for success in NEET Chemistry. It provides the basis for all scientific measurements and experiments and helps ensure accuracy and precision in scientific results.

History of NEET-CHEMISTRY Physical word and measurement

The concept of physical measurement has been an integral part of scientific inquiry since ancient times. The ancient Greeks were among the first to develop a system of measurement, which they based on the length of the human body. However, it was not until the 17th century that a systematic approach to measurement was developed.

One of the earliest scientists to make significant contributions to the study of measurement was Galileo Galilei. Galileo developed the concept of the scientific method, which involves making observations, formulating hypotheses, and conducting experiments to test those hypotheses. He also developed new methods for measuring time and distance.

In the 18th and 19th centuries, the French Academy of Sciences developed a standardized system of measurement, which was eventually adopted by many countries around the world. This system, known as the metric system or the International System of Units (SI), is based on the meter, the kilogram, and the second.

The study of physical measurement and its importance in scientific inquiry continued to develop throughout the 20th century. In particular, the development of modern technologies, such as computers and advanced sensors, has greatly enhanced the accuracy and precision of scientific measurements.

In the context of NEET Chemistry, the study of physical measurement and its importance in scientific inquiry is a foundational topic. A strong understanding of this topic is essential for success in the field of chemistry and in the broader scientific community.

Summary – Nature of Physical World and Measurement

Physical science is a test science where estimations made should be communicated in units.

· All actual amounts have an extent (size) and a unit.

· The SI unit of length, mass, time, temperature, electric flow, measure of substance and brilliant force are meter, kilogram, second, kelvin, ampere, mole and candela separately.

· Units of all mechanical, electrical, attractive and warm amounts are determined regarding these base units.

· Screw check, vernier caliper techniques are accessible for the estimation of length on account of little distances.

· Parallax, RADAR strategies are accessible for the estimation of length on account of significant distances.
The vulnerability in an estimation is called blunder. The precision of an estimation is a proportion of how close the deliberate worth is to the genuine worth of the amount. Each exact estimation is exact however every exact estimation need not be precise.

· At the point when at least two amounts are added or deducted, the outcome can be all around as exact as the least of the singular precisions. At the point when the amounts are increased or separated, the outcome has similar number of critical figures as the amount with the most modest number of huge figures.

· Layered examination is utilized to perform speedy beware of the legitimacy of conditions. Whenever the amounts are added, deducted or compared, they should have a similar aspect. A correspondingly right condition may not be a genuine condition but rather every genuine condition is essentially correspondingly right.

Nature

Nature, in the broadest sense, is the actual world or universe. “Nature” can allude to the peculiarities of the actual world, and furthermore to life overall. The investigation of nature is a huge, if not by any means the only, part of science. Despite the fact that people are important for nature, human action is in many cases perceived as a different class from other normal phenomena.

The word nature is acquired from the Old French nature and is gotten from the Latin word natura, or “fundamental characteristics, natural demeanor”, and in old times, in a real sense signified “birth”. In old way of thinking, natura is generally utilized as the Latin interpretation of the Greek word physis (φύσις), which initially connected with the inborn qualities of plants, creatures, and different highlights of the world to create of their own accord. The idea of nature all in all, the actual universe, is one of a few developments of the first notion; it started with specific center uses of the word φύσις by pre-Socratic scholars (however this word had a powerful aspect then, particularly for Heraclitus), and has consistently acquired cash from that point forward.

During the coming of present day logical technique over the most recent a few centuries, nature turned into the uninvolved reality, coordinated and moved by divine laws. With the Modern upset, nature progressively became seen as the piece of reality denied from deliberate intercession: it was consequently thought to be as sacrosanct by certain customs (Rousseau, American introspective philosophy) or a simple dignity for divine provision or mankind’s set of experiences (Hegel, Marx). Be that as it may, a vitalist vision of nature, nearer to the presocratic one, got reawakened simultaneously, particularly after Charles Darwin.

Inside the different purposes of the word today, “nature” frequently alludes to geography and untamed life. Nature can allude to the overall domain of living plants and creatures, and at times to the cycles related with lifeless things — the way that specific sorts of things exist and change willingly, like the climate and geography of the Earth. It is frequently interpreted as meaning the “common habitat” or wild — wild creatures, rocks, woodland, and overall those things that poor person been significantly modified by human mediation, or which continue notwithstanding human intercession. For instance, fabricated articles and human communication by and large are not viewed as a feature of nature, except if qualified as, for instance, “human instinct” or “the entire of nature”. This more customary idea of normal things that can in any case be found today suggests a differentiation between the regular and the fake, with the counterfeit being perceived as that which has been created by a human cognizance or a human psyche. Contingent upon the specific setting, the expression “regular” could likewise be recognized from the unnatural or the supernatural.