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과학 법칙과 이론
In science, a law is defined as a concise, verbal or mathematical, statement that summarizes a vast number of experimental observations. It…
과학적 방법
Chemistry is an empirical science. Scientists often pose questions to understand the chemistry in everyday life and seek answers to these questions.…
상태에 따른 물질 분류
Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air,…
구성에 따른 물질 분류
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.  A pure substance…
물질의 물리적 성질과 화학적 성질
The characteristics that enable us to distinguish one substance from another are called properties. A physical property is a characteristic of…
에너지란 무엇인가?
The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate…
측정: 표준단위
Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the…
측정: 유도단위
The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length,…
측정불확도: 정확성과 정밀성
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the…
측정불확도: 기구 읽기
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process.…
측정불확도: 유효숫자
All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a…
차원 해석
Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this…
메탄 배출량의 정량화를위한​​ 설계 및 전체 흐름 샘플링 시스템 (FFS)의 사용
The use of natural gas continues to grow with increased discovery and production of unconventional shale resources. At the same time, the natural gas…
알 데히드 류와 Ketones 반응 황산 추출 프로토콜을 사용 하 여 혼합물에서 분리
The purification of organic compounds is an essential component of routine synthetic operations. The ability to remove contaminants into an aqueous…

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