Pico prefix

Prefix deci- centi- milli- micro- nano- pico- fcmto- atto- zepto-... 

WFor very large or very small quantities, commonly used prefixes represent amounts that vary by three powers of 10, for example, milli, micro, nano, and pico (10 3,10 6,10 9, and 10 l2, respectively). 

Some databases use the standard prefixes of micro (u), nano (n), and pico (p) for values that would require several zeros after the decimal delimiter to indicate the correct order of magnitude. While such prefixes are correct, they can also lead to typographical mistakes (the letters m and n are beside each other on most keyboards) that may be difficult to spot. For example, an earlier version of the RTECS showed the oral rat LD50 value for tetrachlorodibenzodioxin (TCDD) as 24,000 mg/kg, while the original source reported it as 24 ng/kg. At the same time, a number of zeros can also lead to mistakes by the addition or loss of a zero. An example of this can be found in the database by Wauchope et al. (1992), which gives a literature value for the solubility of the insecticide cyromazine as 13,600 mg/L, but then provides a recommended value of 136,000 mg/L. Only after comparison of these values will the erroneous recommended value become apparent. 

C. The prefix "p" for "pico-" indicates 1CT12. A kilodalton is 1000 atomic mass units. 

In trace analysis, the units used for component content should be appropriate for the amount. The most proper system is to give the mass fraction (wb) of the trace component (B) in SI units with the appropriate prefix milli- (10 ), micro- (10 ), nano- (10 ), pico- femto- (10 ), or atto- (Table 1.1). The... 

B. pico, nano, milli, centi]—As shown in Figure 2-1 d, answer B has the prefixes arranged from smallest to largest. 

Prefix deci centi milli micro nano pico... 

State the numbers or fractions represented by the following metric prefixes, and write their abbreviations giga, mega, kilo, centi, milli, micro, nano, and pico. (For example, kilo is 10 and is represented by k.)... 

Write the numbers represented by the following prefixes (a) mega-, (b) kilo-, (c) deci-, (d) centi-, (e) milli-, (f) micro-, (g) nano-, (h) pico-. 

We shall first review the common units of weight and volume in the metric system and then describe methods of expressing results. The gram (g) is the basic unit of mass and is the unit employed most often in macro analyses. For small samples or trace constituents, chemists use smaller units. The milligram (mg) is 10 g, the microgram (/xg) is 10 g, and the nanogram (ng) is 10 g. The basic unit of volume is the liter (L). The milliliter (mL) is 10" L and is used conunonly in volumetric analysis. The microliter (/xL) is 10 L (10 mL), and the nanoliter (nL) is 10 L (1Q- mL). (Prefixes for even smaller quantities include pico for 10 and femto for 10" .)... 

The prefix multipliers allow us to express a wide range of measurements in units that are similar in size to the quantity we are measuring. You should choose the prefix multiplier that is most convenient for a particular measurement. For example, to measure the diameter of a quarter, use centimeters because a quarter has a diameter of about 2.4 cm. A centimeter is a common metric unit and is about equivalent to the width of a pinky finger (2.54cm = lin.). The millimeter could also work to express the diameter of the quarter then the quarter would measure 24 mm. The kilometer, however, would not work as well since, in that unit, the quarter s diameter is 0.000024 km. Pick a unit similar in size to (or smaller than) the quantity you are measuring. Consider expressing the length of a short chemical bond, about 1.2 X 10 m. Which prefix multiplier should you use The most convenient one is probably the picometer (pico = 10 ). Chemical bonds measure about 120 pm. 

The second (s) is the SI base unit of time (Figure 1.22). Combining this unit with prefixes such as milli-, micro-, nano-, and pico-, you create units appropriate for measuring very rapid events. The time required for the fastest chemical processes is about a picosecond, which is on the order of how fast supercomputers can perform a single calculation. When you measure times much longer than a few hundred seconds, you revert to minutes and hours, an obvious exception to the prefix-base format of the International System. 

The origin of the prefix femto is the Danish word femten, meaning fifteen . Pico is derived from the Italian word piccolo, meaning small. Nano is derived from the Greek word vavoq, meaning dwarf. ... 

Pico P SI unit of pressure or stress. This name accepted by the 14th Conference Generate des Poids et Mesures. SI prefix for 10 2. 

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