What is laeching?

What are the discussion for experiment basic techniques of microscope? What is a molecule in science? How many Newtons are needed to push a car? What does virbration pass from the eardrum? How do you tell a mixture from a solution? How do you reverse dissolved sugar? What is possionier? Would a scientist measure your body temperature in Fahrenheit? 11 cm equals how many inches? Why do weather balloons expand as they rise through the troposphere? What is the female reproductive structure in a plant called? The conversion of Metric into Standard American English SAE for nuts and bolts? What is it that makes us think that a certain item is lucky? The first step of an experiment is called? Is tea cosy a thermal insulator? How did the results of JJ Thomson's experiments change how scientists thought about atoms? Why do you need to record the observations when performing an experiment? What can you use a signal generator to find? What kind of thermometer do you use to measure cold water? Why was the light bulb necessary?