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Measuring Tools
Measuring instruments includes a vast amount of tools and instruments used for measuring. This would include micrometers (various types for various applications), scaled rules, durometers, spectrometers, tape measures, dumpy levels, spirit levels, combination sets, gauge blocks, vernier calipers, dial indicators, inside and outside calipers, etc.
1,282 Questions
The astrolabe was used by the ancients ( III siecle B.C. in Greece)
for observing the relative positions and altitudes of celestial bodies.
In the Middle Age it become a navigational instrument by the addition
of tables of the Sun´s declination ( angular distance north or south of
the celestial equator), which permitted the sea Navigants to find their
latitude.
In its earlier form it consisted of a disk of wood suspended by a ring.
Around the disk edge were marked the degrees of the circle; a pointer
along which the sun or another star could be sighted was pivoted on a
center pin.
Later on the astrolabes were often made of metal with a plate with the
map of the stars and the zodiac circle on the reverse side. It was then
possible determine the time of the day: after measuring the sun´s altitude,
its position was noted on the circle of tfuyjfyjytjfhe zodiac, a line drawn to a circle
of hours showed the time.
What is The tool to measure an irregular shape?
The answer depends on what characteristic you want to measure: its perimeter, area, mass, temperature, albedo, etc.
Process of Measuring Horizontal Angles Using a Theodolite 1. Setting up the Theodolite: This includes mounting the theodolite on a tripod and making sure it is comfortable for the user. 2. Unlock the upper horizontal clamp. 3. Rotate the theodolite until the arrow in the upper or lower rough sight points to the feature of interest and lock the clamp. 4. Look through the main eyepiece and use the upper horizontal adjuster to align the vertical lines on the feature of interest. 5. The reading is taken by looking through the small eyepiece. Using the minutes and seconds adjuster set the one of the degrees on the horizontal scale so the single vertical line on the bottom scale is between the double vertical lines under the selected degree. 6. The reading is the degree which has been aligned and the minutes and seconds read from the right hand scale and is the horizontal angle from the reference line. Process of Measuring Vertical Angles Using a Theodolite
Process of Measuring Vertical Angles 1. Setting up the Theodolite: This includes mounting the theodolite on a tripod and making sure it is comfortable for the user. 2. Unlock the vertical clamp and tilt the eyepiece until the point of interest is aligned on the horizontal lines. Lock the clamp in place. 3. Looking through the small eyepiece, use the minutes and seconds adjuster to align one of the degrees on the vertical scale with the double lines just below it. 4. The reading is the degree that has been aligned and the minutes and seconds is read from the right hand scale. 5. To complete the reading, it may be necessary to measure the distance from the theodolite to the point of interest.
The above is al true, but doesn't discuss the practical uses of a theodolite. For example, if you want to know the height of the top of the gable on a house, you could use a theodolite. First, set up the theodolite (btw, I made one with a piece of copper tube, a protractor and a cheap wooden tripod) as noted above, make sure the ground is pretty level between the house and the theodolite, and then measure the distance from the vertical side of the house to the theodolite. (You may choose to move the theodolite so that the distance is the square of a whole number.) Then aim the scope (tube) at the upper-most point of the gable and note the degree of angle on the protractor. If you have pretty level ground between the theodolite and the house, the angle at the intersection of the side of the house and the ground should be 90 degrees. So, now we have two angles (the 90 degrees at the intersection of the side of the house and the ground, and whatever angle you recorded at the theodolite) and a side (the distance from the house to the theodolite). With this information, you can calculate the third angle and the other two sides, one of which will be the hypotenuse and the other will be -- tada! -- the final leg, which will tell you the height of the point you picked out at the top of the gable.
What is a graduated cylinder divided into?
A graduated cylinder is divided into ounces or milliliters.
Convert centimeters to micrometers?
A centimeter is 1/100 of a meter, a micrometer is 1/1,000,000. So there are 10,000 micrometers in one centimeter
What would you use to measure volume?
It depends on the amount you want to take. If it is microlitres, you can use a micropipette, millilitres, a pipette (a burette would be more accurate), and if greater than that, it is best to use a large graduated cylinder. A graduated cylinder is more inaccurate than a pipette, but at volumes of 500ml for example, it is impractical to use a pipette.
Why is a micrometer better than a vernier caliper?
They are not. You use the most suitable instrument for the task in hand.
Some people find verniers more difficult to read unless there is a digital readout.
What would you use to measure paper?
Paper is measured in several different ways. Size is usually simply measured in inches or centimeters. 'Weight' is used to measure the thickness, as in 10 pound or 20 pound. The most common quantity is a ream, a package of 500 pages.
This really can include lots of tools. Things such as tape measure, ruler, plumb bob, level, Line level, and speed square. Levels are really measuring devices, but it is impossible to build a deck or something of that sort without one. Good luck.
What do the little red diamond markings on a tape measure or rule signify?
If the marks are at 16 inches, 32 inches, 48 inches, etcetera, those are the distances studs in a wall are supposed to be apart, measured from the center of one stud to the center of the next one. Wall studs are the vertical pieces of wood which the sheetrock is nailed to. I think the marks indicate 1/2 meter increments.
A multimeter is an instrument used to check for AC or DC voltages, resistance and continuity of electrical components, and small amounts of current in circuits. This instrument will let you check to see if there is voltage present on a circuit.
The Greeks had simple thermometers in the first century BC.
Galileo Galilei (1564-1642) Italian physicist, invented a basic air thermometer.
Daniel Gabriel Fahrenheit (1686-1736) was the German physicist who invented the alcohol thermometer in 1709, and the mercury thermometer in 1714. In 1724, he introduced the temperature scale that bears his name - Fahrenheit Scale.
The Celsius scale, invented by Swedish Astronomer Anders Celsius (1701-1744), has 100 degrees between the freezing point (0 C) and boiling point (100 C) of pure water at sea level air pressure.
The Celsius temperature scale is also referred to as the "centigrade" scale. Centigrade means "consisting of or divided into 100 degrees". The term "Celsius" was adopted in 1948 by an international conference on weights and measures.
What is the advantage of timing full minute to find your pulse?
For the perfect evaluation of heart beat.
What is science used for in hospitals?
i dnt know, i answered the question:@:@
thanks for wasting my time
What does a segment of an ECG tracing indicate?
P waves represent the atrial depolarization. QRS complex represent the ventricular depolarization. T waves represent the ventricular repolarization.
How a tympanic membrane thermometer measures body temperature?
An instrument that measures temperaature in the ear.
You place the leads across the part of the circuit you wish to evaluate and look at the display. Choosing the right range on the meter will improve accuracy. Make sure there is no power applied to the circuit!
Like magnetic poles repel, unlike magnetic poles attract. So the magnetic south and magnetic north of two bar magnets will attract. Therefore, though the compass needle points towards the magnetic north, it is actually the magnetic south pole of the compass needle that is pointing towards the magnetic north.
What are the tools used to measure in science?
There are too many measuring tools in science to list them all, but I'll list a couple.
- Ruler (measuringsmall distances)
- Pipettes & Graduated Cylinders (measuring liquids)
- Scales (measuring weight and mass)
- Anemometers (measuring wind speeds)
- Thermometers(measuring temperatures)
In principle, you can make ALL scientific measurements with:
- Ruler
- Clock
- Pendulum
- Scale
- Ammeter
- Light meter
1)Pan Balance
2)Floating Plate
3)Chemical Balance
4)Alcohol Thermometre
5)Hourglass
Where is 7.8 inches 0n a ruler?
10mm is 1cm. Therefore, 70mm is 7cm. Just move the decimal point over to the left when you are upsizing the unit.
Why is a meter rule used to measure the initial length of a bar?
The length of a meter was originally determined with a metal reference, keep to this day in Paris, France.
What is the main difference between protein electrophoresis and nucleic acid electrophoresis?
There are many similarities and differences between protein and DNA electrophoresis.
Similarities:
- PAGE protein and DNA electrophoresis both cause separation by size, creating bands that are viewed by the scientist or a machine. The smallest segments more the fastest due to less friction with the surface of their medium or equipment.
- The movement of charges through the medium is what causes the DNA or proteins to move. Electrons move from the negative to positive end of the gel or capillary tube.
Differences:
- In PAGE protein electrophoresis, a polyacrylamide gel is used to prevent convection from altering the movement of the proteins. If the proteins are charged, and there is a worry that the charge will affect the mobility of the protein segments, 1% SDS can be added to get rid of the mass/charge issue. This way, only the mass of the segment determines how far it moves. In DNA capillary electrophoresis, the size of the capillary is so small that it does not have room for convection to occur (it is only 20-50 microns wide). Thus, there is no medium in the capillary but DNA itself.
- In protein electrophoresis, the proteins are often dyed so their movement can be viewed with the naked eye, or a machine. With DNA capillary electrophoresis, DNA strands are made through DNA replication with dNTPs that are fluorescently labeled for the different nucleotides. Each base is labeled a different color. A fine laser lights up the DNA strand in the capillary tube and reads what color fluoresces. This is how the nucleotide is identified.
- Protein PAGE electrophoresis is used to determine the purity of a protein sample. It can also be used to see how large the chains are that make up a multi-chain protein if a denaturing agent is added. DNA electrophoresis is used to get the order of nucleotides in a DNA sequence. It is done by chopping the DNA sequence into many smaller bits and sequencing them, then putting them back together by lining them up according to sequence overlaps. This is called the "shotgun" method. Protein electrophoresis can figure out the order of about 15-20 amino acids by a similar method, but DNA electrophoresis can get up to 1000 nucleotides (~300 amino acids). DNA electrophoresis is limited by the low probability that the DNA sequence would be cut into a segment greater than 1000 nucleotides.
