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It all depends on what is in the test tube and just what kind of green pigment.
An oxygen meter measures the amount of oxygen from the pulse in a finger by being placed on an individuals fingertip which causes two wavelengths to be able to pass through the individual to a photo detector.
it is placed in the Stevenson Screen to shelter it from direct sunlight
The Peso sign is placed before the amount.
Donkeys
air pressure a+
Rate pressure product indicates the amount of stress being placed on the heart muscle. The measure is taken by multiplying the heart rate with the systolic blood pressure.
A: It can be two things one a resistor to limit the current to a safe level and two is a hi resistor placed across the LEDS if placed in series with hi voltage source. That will equalize the leakage current so the string will not fail because of it.
The sign for the Pound Sterling is placed before the amount.
The amount of force is called stress.
Because that is what you are trying to measure.
Current is the amount of electrons flowing. An ammeter reads this value. Typically an ammeter will be placed in series to measure this flow; there are also "clamp on" ammeters that use a small CT. When placed around a wire, the power flowing in the wire will induce a current in the CT, allowing measuremnt without lifting wires.