How is the viscosity of liquids?
In many scientific and industrial situations, it is necessary to know the viscosity of liquids. Viscosity is a measure of liquid resistance to flow. High viscosity liquids have greater flow resistance and are not easily deformed by physical stress, while low viscosity liquids are "thin" and easy to flow. The viscosity of liquids can be found using a tool known as a viscosimet, which are many different types. In cases where less accurate measurements are acceptable, viscosity can also be measured using simple gravity -based devices. This setting measures the viscosity of the liquid by timing how long a small ball of known density and size takes to fall at a certain distance of the liquid. The ball is placed in a vertical tube filled with liquid and is left to achieve its speed. At the terminal speed, the power towing of the tkou up is equal to the gravitational force that pulls it down, and the ball ceases to speed up and maintains constant speed when it decreases. Once isKnown speed, liquid and ball density and ball size can be used to calculate the viscosity of the liquid, the formula, Stokes law, Stokes law.
Another relatively simple viscosimeter used in laboratory settings is Viscometer Ostwald, also known as a glass capillary viscosimet or U-Tube viscomter. This glass -shaped glass tubular device consists of two bulbs, one at the bottom of the left shoulder U and the other on the high part of the right part. It is held vertically when the liquid is stretched into the upper bulb and then lets it flow back down into the lower bulb, around two marks on the tube. The viscosity of the liquids can be derived from the diameter of the glass tube, the time for which the last for the liquid flows around two brands and the density of this liquid.
Laborators that require accurate measurements can use more sophisticated viscomers that include ELECHTronics and measure viscosity using an oscillating piston or a vibrating resonator submerged in a liquid. In other settings, such as the painting industry, simpler physical principles can be used to derive the approximate viscosity of liquids. These measurements often rely on measures known as kinematic viscosity - the resistance of the liquid to flow in the presence of gravity.
ZHN Cup and a cup of Ford viscosity are examples of gravity devices used to measure kinematic viscosity. In these devices, the liquid - color, in the case of a cup or engine oil for a cup of Ford - flows through a small hole at the bottom of the cup, as held at the top. The liquid flows in a smooth stream to a certain point when it falls into drops. Depending on the viscosity of the liquid, breaking occurs at different times. The Kinematic viscosity rate can be found in seconds according to the cup specification number, which is calibrated for the appropriate liquid.