Gas and Chemical Exposure. NOTE: This is the Consumer Version. Symptoms depend on which gas or chemical is inhaled and how deeply and for how long it was inhaled. Symptoms may include irritation of the eyes or nose, cough, blood in the sputum, and shortness of breath. Chest x-rays, computed tomography, and breathing tests are used to determine how much lung damage has occurred.
Scope refers to the visibility of variables and methods in one part of a program to another part of that program. The importance and meaning of scope varies between languages, but there are two general scope concepts many languages have in common: local and global scope.
An oscilloscope presents electrical information in the tiime domain. That is the basic function of a scope. This means that it converts the input signal to an x-y graph where x is the time and y is the amplitude of the input. The line seen on the scope is called the trace. The time it takes to go from the left to the right of the screen is the time base. In a scope you can adjust the time base from up to a few seconds to a few nano seconds. Varying this time base gives users the ability to analyse the signals at different frequencies.