What is a trough of liquid?
a shallow dishlike vessel filled with a liquid, usually water, and used in collecting gases by displacement of liquid from a filled jar held with its open end under the surface of the liquid. Collins English Dictionary. Copyright © HarperCollins Publishers.
What is fixed air in chemistry?
Noun. fixed air (uncountable) (chemistry, now historical) Carbon dioxide; carbonic acid.
Who were the forerunners in the field of pneumatic chemistry during the late 17th and 18th centuries?
Alessandro Volta began investigating pneumatic chemistry in 1776 and argued that there were different types of inflammable air based on experiments on marsh gases. Pneumatic chemists credited with discovering chemical elements include Joseph Priestley, Henry Cavendish, Joseph Black, Daniel Rutherford, and Carl Scheele.
What is the use of triangular file in laboratory?
Triangular File: Description: Metal file with three cutting edges. Uses: To scratch glass or file.
What is trough science?
Trough – the lowest point below the rest position. Amplitude – the maximum displacement of a point of a wave from its rest position. Wavelength – distance covered by a full cycle of the wave. Usually measured from peak to peak, or trough to trough.
What is a trough?
A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area. The weather charts in some countries or regions mark troughs by a line. In the United States, a trough may be marked as a dashed line or bold line.
Which is vitiated gas?
The gas which contains a lower concentration of oxygen is called vitiated gas.
Why was it called fixed air?
His initial interest was in alkalis such as limewater that were thought to be useful in the treatment of renal stone. When he studied magnesium carbonate, he found that when this was heated or exposed to acid, a gas was evolved that he called “fixed air” because it had been combined with a solid material.
Who is known as the father of modern chemistry?
Antoine Lavoisier
Antoine Lavoisier: the Father of Modern Chemistry.
What is the modern chemistry?
Modern chemistry describes the composition, structure and physical and chemical properties of substances. The main aim of modern chemistry is to improve the communication and conversation among the scientists, researchers, engineers and policy makers, who are working under the area of modern chemistry.
What is iron stand in laboratory apparatus?
This lab equipment is used to support and hold various flasks, beakers and other glass ware when not in use and also during experiments. xviii. Spatula – is used to take and handle small quantities of solid chemicals. It is used like a spoon or an instrument for scooping material out of a container. 3.
What does a ring stand do?
: a metal stand consisting of a long upright rod attached to a heavy rectangular base that is used with rings and clamps for supporting laboratory apparatus.
What is the definition of trough in science?
In science. Trough (economics), the lowest turning point of a business cycle. Trough (geology), a long depression less steep than a trench. Trough (meteorology), an elongated region of low atmospheric pressure. Trough (physics), the lowest point on a wave.
What does trough mean in medical terms?
Freebase (4.00 / 1 vote)Rate this definition: Trough level In medicine, a trough level is the lowest level that a medicine is present in the body. In a medicine that is administered periodically, the trough level should be measured just before the administration of the next dose in order to avoid overdosing.
What does Trought mean?
Webster Dictionary (5.00 / 1 vote)Rate this definition: Trough(noun) a long, hollow vessel, generally for holding water or other liquid, especially one formed by excavating a log longitudinally on one side; a long tray; also, a wooden channel for conveying water, as to a mill wheel.