- Read the main scale. Look for the last whole increment visible before the 0 (zero) mark.
- Read the secondary scale (Vernier) measurement. This is the division tick mark that lines up best with a mark on the main scale.
- Add the two measurements together.
How do you read a chemistry scale?
How do you read the uncertainty of a scale?
This is a measure of how well a scale can be read. For an analogue scale, the uncertainty is ± half of the smallest scale division. For a digital scale, the uncertainty is ± 1 in the least significant digit.
What is the proper means of reporting the measurement of the volume of water?
The volume of a liquid can be directly measured with specialized glassware, typically in units of milliliters (mL) or liters (L). In this lab, a beaker, two graduated cylinders and a burette will be used to measure liquid volumes, and their precision will be compared.
What does the scale 1 50 mean?
The ratio is marked at the left end of the scale. For example, the scale of 1:50 means that 1 mm on the drawing represents 50 mm on the object. This means that the object is 50 times larger than the drawing of it. An object 450 mm long would be represented by a line 9 mm long (450 mm/50).
How do you read a scale in ounces?
How do you record uncertainty?
Uncertainties are almost always quoted to one significant digit (example: ±0.05 s). If the uncertainty starts with a one, some scientists quote the uncertainty to two significant digits (example: ±0.0012 kg). Always round the experimental measurement or result to the same decimal place as the uncertainty.
How do you read cm on a ruler?
What is the uncertainty of a 1000 mL graduated cylinder?
In the graduated cylinder shown in Figure 1, the mL graduations are marked and can be read with certainty. All graduated glassware is read with one estimated digit, so this measurement is recorded correctly to the nearest 0.1 mL, with an understood uncertainty of ± 0.1 mL.
How do you read a 250 mL graduated cylinder?
What is the reading on this graduated cylinder to the correct number of significant figures?
When taking a volume reading in a flask you may read the value from a different angle each time?
When taking a volume reading in a flask, you may read the value from a different angle each time. Measuring the mass of a sample on an analytical balance may produce different values as air currents affect the balance or as water enters and leaves the specimen.
What does the scale 1 is to 50000 mean?
A scale of 1 : 50 000 is used on many Ordnance Survey maps. This means that 1 cm on the map represents an actual distance of 50 000 cm (or 500 m or 0.5 km). We saw above that if a map has a scale of 1 : 50000, then 1 cm on the map is 50000 cm in real life.
What does a 1/2 scale mean?
Half scale is 1:2. It is helpful to think of this as one unit on the drawing equals two units on the object. A small object can be enlarged on the paper and drawn in 2:1 scale. This means the drawing of the object is twice as large as the object itself.
What does it mean scale 1 100?
A scale is shown as a ratio, for example 1:100. A drawing at a scale of 1:100 means that the object is 100 times smaller than in real life scale 1:1. You could also say, 1 unit in the drawing is equal to 100 units in real life.
Is digital scale in pounds and ounces?
Digital scales measure weight in pounds and ounces, and many include metric measurements of grams and kilograms. With some basic rudimentary math, reading ounces on a digital scale is simple.
What is 3/4 of a pound on a scale?
Three-quarters of a pound is 12 ounces. This means there are 12 ounces in 3/4 of a pound.
How do you read 1 gram on a scale?
How do you calculate IB uncertainty in chemistry?
- The uncertainty in the pipette = 25 ± 0.04 ml.
- The uncertainty in HCl addition = 1.0 ± 0.1 ml.
- The uncertainty in time taken = 32 ± 2 s.
- The percentage uncertainty in the pipette = 0.04/25 x 100 = 0.16%
- The percentage uncertainty in the HCl volume = 0.1/2 x 100 = 5%
What is an acceptable percentage uncertainty?
In some cases, the measurement may be so difficult that a 10 % error or even higher may be acceptable. In other cases, a 1 % error may be too high. Most high school and introductory university instructors will accept a 5 % error.
How do we account for an instrument’s precision when recording data?
We can determine the degree of precision of any scientific device we are using (metric ruler, balance beam, pipette, graduated cylinder, etc.) by finding the smallest division on the instrument.
What is .8 on A ruler?
What is 1/16 on A tape measure?
Most standard tape measures in the U.S. have markings that measure down to 1/16 of an inch. These are smaller, sometimes thinner markings, evenly spaced between the half-inch and inch marks on a tape measure. On some tapes, quarter inch marks are the same size as eighth-inch marks.
How do we read and write measurements?
- Find/read the markings. On a standard tape measure, the biggest marking is the inch mark (which generally has the biggest number, if it has them).
- As the increments decrease, so does the length of the mark.
- Read 1 inch.
- Read one-half inch.
- The remaining markings follow a similar pattern.
Is a 10 mL or 50 mL graduated cylinder more precise?
Most 50 ml graduated cylinders have markings spaced every milliliter while 10 ml graduates have markings every tenth of a milliliter. If we measure a small volume of liquid in a 10 ml graduate, our measurement should be more accurate than if a 50 ml graduate were used.