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15 paź 2022 · In this lab, you will be introduced to some common measuring devices, and learn how to use them to obtain correct measurements, each with correct precision. A metric ruler will be used to measure length in centimeters (cm). All measuring devices are subject to error, making it impossible to obtain exact measurements.
- Paper Chromatography of Gel Ink Pens
Use a ruler and draw a plus sign in the center of each spot....
- Significant Figures
The little lines (between the numbered lines) are 0.1 mL...
- Paper Chromatography of Gel Ink Pens
10 gru 2023 · When we multiply a quantity (such as distance given in inches) by an appropriate unit conversion factor, we convert the quantity to an equivalent value with different units (such as distance in centimeters).
A quantity is an amount of something and consists of a number and a unit. The number tells us how many (or how much), and the unit tells us what the scale of measurement is. For example, when a distance is reported as “5 kilometers,” we know that the quantity has been expressed in units of kilometers and that the number of kilometers is 5.
Distance is the length of the path taken by an object whereas displacement is the simply the distance between where the object started and where it ended up. For example, lets say you drive a car. You drive it 5 miles east and then 3 miles west.
Distance is the actual path length that an object moves away from its original position. Distance is a scalar. We use the symbol d for distance. Displacement is the straight-line path between the starting point and the endpoint of a journey i.e. the distance moved in a particular direction. Displacement is a vector.
Figure 1.26 To measure the volume of liquid in this graduated cylinder, you must mentally subdivide the distance between the 21 and 22 mL marks into tenths of a milliliter, and then make a reading (estimate) at the bottom of the meniscus.
The distance travelled relative to the solvent is a constant for a particular compound as long as you keep everything else constant - the type of paper and the exact composition of the solvent, for example.
