There is ringing on the front wall from the big bang that may interfere with detecting the back wall refections. So if you waiting for the second backwall bounce the front wall ringing should be gone and you can measure the difference between the two bounces.
The difference between centimeters and inches is that inches is in the standard measuring system and centimeters is part of the metric measuring system.
With liquids you can just stick in a thermometer into it. But with solids sometimes you can't do that (because it's solid obviously) so I guess measuring liquids is more accurate in most cases.
A tachometer and an auto-meter is an instrument measuring the rotation speed of a car or a motor. An auto-meter is more accurate and reliable than a tachometer.
You can measure the phase difference between 2 pendulums by measuring the distance between the two. The amount it comes out to will be the difference.
yes.
Measuring the difference between the second and third back-wall echo can be more accurate because these echoes are further apart in time, providing a larger time interval to calculate the speed of sound accurately. In contrast, the first and second back-wall echoes are closer in time and can introduce more errors due to the shorter time interval.
measuring cups are used for measuring different liquids and mixing cups are for when you have some liquids that need to get mixed you mix them in it.
a calibrated instrument for measuring the potential difference between two points.
Measurement is simple but measuring width , length and liquid while counting is simple but counting numbers
The difference in pressure between absolute and gauge pressure.
The essential difference between Ostwald and Ubbelohde viscometers is the method of measuring viscosity. Ostwald viscometer measures the flow time of a fixed volume of liquid through a capillary, while the Ubbelohde viscometer measures the flow time of a fixed volume of liquid out of a calibrated capillary. Additionally, the Ubbelohde viscometer is more accurate and suitable for measuring the viscosity of transparent liquids.
a straightedge need not have measuring increments (inches, centimeters, etc.) while a ruler is a straightedge with measuring increments