CHM 120 Lecture Notes - Lecture 1: Unit, Trailing Zero, Decimal Mark
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Average global temperatures have risen by . 6 celsius in the last century (measurement- must always have number and unit) By reporting a temperature increase of . 6 c, they mean . 6 +or- . 1. The temperature rise could be as much as . 7c or as little as . 5c but it is mot 1. 0c. Numbers are usually written so that the uncertainty is indicated y the last reported digit. Scientific notation- technique used to express very large or very. Small numbers more compactly, and easier to write. Two parts: a decimal part: a number that is between 1 and 10, an exponent part: 10 raised to an exponent, n. A positive exponent means 1 multiplied by 10n times. A negitive exponent means 1 divided by 10 n times. Move the decimal point to obtain a number between 1 to 10. Multiply that number (by the decimal part) by 10 raised to the number of places you moved the decimal point.
