In a correctly recorded measurement of 27.5 °C all of the digits are certain, meaning the true temperature is 27.5 °C the 5 is uncertain, meaning the true temperature is between 27.0 °C and 27.1 °C the 5 is uncertain, meaning the true temperature is between 27 °C and 28 °C the 7 and the 5 are uncertain, meaning the true temperature is between 20 °C and 30 °C

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.