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Hi everyone, back again on the education portal channel On this occasion we will discuss a summary of Ipah's 10th grade material, namely about measuring in scientific work This material is already a free curriculum, let's start with all kinds of measuring tools There are so many measuring tools that you can find in everyday life
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The measuring instrument is used depending on what is measured from the object that wants to know its size. Other measuring instruments such as scales, meters, stopwatch, thermometer, compass, glass, etc. Next we discuss the magnitude. Magnitude is something that will be measured. The magnitude consists of two groups, namely the main magnitude and the descent magnitude.
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The main dimension is the basic dimension that the units have been set. While the descent dimension is the dimension that the units are arranged from several main dimension units. Then we also discuss the system of units. Units are the size that becomes the reference point of a dimension.
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The scientific community together made an agreement about a single system of univision that is officially used universally or what can be called an international union. Well, here are some international unions, as in the table below. For example, the name of the unit is long, the size of the label is L, and the international unit is meters. Then the dimension is L. And then you can see here. Then we discuss dimensions.
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Dimension is the way a descent is arranged based on its main dimension. Dimension from the main dimension is a symbol written with a certain capital letter and capital letters, as shown in the following table 1.1. You can see it directly in the dimension section, there are L, M, T, I, and so on. Let's continue to the Sorong level.
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Now pay attention to the picture of the gap in the bottom. You can see there are numbers 1 to 8. For the parts, number 1 is the outer groove, number 2 is the inner groove, number 3 is the depth gauge, number 4 is the main scale in centimeters, number 5 is the inch scale, number 6 is the nonius scale or vernier, number 7 is the inch scale again, and number 8 is the locking bolt.
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So, based on the parts of the Sorong range, we know that the Sorong range has two scales, namely the main scale and the nonius scale. Well, when measuring the use of the Sorong range, there must be a measurement error because it is not studied. Well, it is called the uncertainty value. The formula for the uncertainty value is: delta x = 1/2 times the smallest scale value.
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So the final result calculation must be accompanied by the uncertainty value So the final formula will be X + - Delta X Next, let's discuss the Micrometer Scope Pay attention to the Micrometer Scope image below, there are 1-8 more parts The first part is called Porous Setup or Unfill The second part is Porous Movement or Spindle The third is Frame
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Number 4 is Lock Nut Lock. Number 5 is Sleeve Lock. Number 6 is Timble Lock. And number 7 is Ratchet Knob Lock. In Micrometer Scrooge, there is a formula that is the same as the measurement in the measurement of the jangka sorong. So there must be an uncertainty value. Next, we discuss the important rules. The important number rules and the scientific notation.
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If we calculate using a calculator, sometimes the results are very long, depending on the calculation. For example, the result is 7.641404. Well, that time it was long and confusing, then there is an order called the important number rule. The important number rule is the rule of rounding and writing the result of data processing agreed to round the results of processing.
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For example, find the surface width of a bottle cap with a diameter of 3.12 cm measured with a ruler. After counting, the result is 7.641404. The important conclusion is the diameter of the bottle cap. So the circumference is 3 numbers according to the diameter of the bottle cap which is only 3 numbers, which is 3.12. So the circumference of the result is 7.64.
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How? Easy to determine the important value? Next, the uncertainty value in the measurement repeats. Humans must not be afraid of the so-called error, so in the measurement. So when measuring, don't just once, at least 5 times. Because it is calculated 5 times, the uncertainty value becomes 5, right? Well, to get the uncertainty value of repeated measurements, you can use the following standard deviation equation.
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Well, maybe that's enough, thank you for watching this learning video until it's finished. Hopefully it's useful for all of us, don't forget to like, comment, and subscribe.
