Meter stick

In this experiment students measure the length of a pestle using a wooden meter stick, a stainless-steel ruler, and a vernier caliper. The data collected in this experiment provide an opportunity to discuss significant figures and sources of error. Statistical analysis includes the Q-test, f-test, and F-test. 

There is an intuitive feeling that for a given uncertainty in response, the farther apart the two experiments are located, the more precise the estimate of Pj should be. An analogy is often made with the task of holding a meter stick at a particular angle using both hands if the meter stick is grasped at the 5- and 95-cm marks, a small... 

Figure 17.3 Potato tubers harvested from (left to right) cvs. Norchip, Kennebec, Norland, and Superior after 10S days growth at 20°C and a 12-h photoperiod with 400 pimol s of PAR. A meter stick was place in the photo for reference.

Brick-sized block of ice flat board, such as length of 2-by-4 or meter-stick two straight-back chairs thin metal wire about 1 meter long (copper works best) two heavy weights, such as dumbbells or plastic milk jugs filled with water... 

Which meter stick offers greater precision ... 

Whether the meniscus height is measured with a cathetometer or a meter stick, it is important to have good illumination of the meniscus and to do the illumination in a consistent manner throughout a set of measurements. A sheet of white paper behind the manometer often provides good definition of the meniscus. Under many lighting conditions, illumination of this paper from behind may further improve the visibility of the meniscus. 

A balance can be used to measure weights. Make a balance like the one shown. Tie a paper bag to each end of a meter stick. Tie another string in the middle of the meter stick and have a friend hold the string. Move the string along the stick until you get the bags balanced at the same height from the floor. 

A meter stick or yardstick Two grocery bags Five pieces of string... 

Epsom salt metal cookie sheet meter stick... 

Now that we know what decimals are, how can we use them Think about a meter stick. A meter is about 3.28 feet, which is a little longer than a yard. A typical door is about 2.5 meters tall. That means that two full meter sticks plus five tenths of a meter stick, placed end to end, would be the same height as the door. Without decimals, we would have to say that the door was two meters tall or three meters tall. Decimals allow us to be more precise with our measurements. 

TAKE A METER stick and measure five objects in meters. Write your answers to two decimal places. For instance, you might find that your television remote control is 0.18 meters long and your bed is 1.72 meters long. Save these measurements-we ll use them in a little while ... 

The measurement of temperature is a measurement of energy and therefore has different measurement characteristics than other properties. The primary difference in temperature measurement is that it is not cumulative. You can take two different meter sticks and place them end to end to measure something longer than one meter. The comparable action can be made for the measurement of mass. 

In the laboratory, the ruler is the meter stick. The meter stick may have inch measurements on one side (1 meter = 39 3/8 inches), but a yardstick, or any ruler of 6, 12, or 18 inches has limited value in the laboratory unless it also has metric measurements in addition to English measurements. 

Because measurements using a meter stick are straightforward, no explanation is provided. There are, however, two possible complications when using a meter stick. One problem is reading beyond the limits of the measurement device, and the other is parallax (see Fig. 2.1, Fig. 2.2, and Fig. 2.3). 

Meter sticks have major limitations in that they can only measure flat objects. For example, it is impossible to accurately measure the outside diameter of a round-bottom flask, the inside diameter of an Erlenmeyer flask neck, or the depth of a test tube with a meter stick. Fortunately, there are various devices and tech-... 

Once depth is established with a depth gauge, measurement can be read directly, or the device is removed and laid onto a meter stick to determine depth measurement. 

The ends of a pair of dividers can be inserted into an object to obtain an internal measurement. The dividers are then removed and laid on a meter stick to obtain the measurement. 

Aside from meter sticks, there are other instruments used for linear measurement such as the caliper and micrometer. Their designs and mechanisms for use are very different, but both meet specific needs and have specific capabilities. 

A right-angle triangle pressed against a round surface that is up against another right-angled surface will provide a linear surface for a meter stick to make a... 

Measurement of temperature (or any energy property) has one major difference from measurement of physical materials It is not cumulative. To measure the length of a room, you can lay several meter sticks end to end. The sum of the number of meter sticks will be the length of the room. Temperature, however, is not cumulative. If you have a liquid that is hotter than the range of temperatures measurable on one thermometer, you cannot use a second thermometer to obtain the remaining temperature. 

For the flowing clock modification two 250-mL graduated cylinders three-way stopcock in-line stopcock 1 m of 2-mm-bore Pyrex capillary tubing meter stick cormecting tubing water aspirator or other rough-vacuum source 1-L trap assorted clamps and ring stands stopwatch thermostat bath appropriate solutions. 

To measure wavelengths, adjust the second lens position to focus the beams on the wall (or screen). Tape sheets of paper to the wall at the 0 and 1 order diffraction positions. Attenuate (or block) the brighter beams, and taking care to avoid the diffracted beams, mark the location of all spots with a nonreflecting pencil. Block the pump laser beam before the cell and measure the x and values of the marks with a meter stick or tape measure as accurately as possible. Other variants of the experiment are possible for example, a reflection rather than transmission diffraction grating conld be employed as the dispersing element for these simple wavelength measnrements. 

Apparatus Eudiometer, mercury, mercury trough, ammonia gas generator and drying apparatus, induction coil, battery, meter stick, barometer, and thermometer. 

The factor H must be subtracted from the barometer reading because the gas is supporting only that column of mercury which is the difference between the barometer column and the column extending from the surface of the mercury in the trough to the upper surface of the mercury in the tube — found by actual measurement with a meter stick. 

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