What's the difference between a gas alarm and a smoke detector?

The difference between gas alarm and smoke detector, these two products whetheruse, appearance or installation, the difference is very big.  
 
The full name of the gas alarm is combustible gas leakage detection alarm, as thename implies, is used to detect combustible gas, if the gas leakage is found, it willissue an alarm.  Common combustible gases are natural gas, coal gas, liquefied petroleum gas, biogas, gas and so on.  Natural gas, gas and liquefied petroleum gas are common sources of energy in most households.  Because these gases are flammable and explosive, once an accident occurs, it will certainly cause serious damage, so it is particularly important to find leakage in time.  
 
The gas alarm is generally installed near the gas source to facilitate the detection of gas leakage in the first time.  The density of natural gas and gas is smaller thanthat of air. When the gas leaks, it will float up. In this case, the gas alarm shouldbe installed above the gas source.  The density of liquefied petroleum gas is larger than that of air, and it will sink when it leaks. In this case, the gas alarm should be installed below the gas source.  General household gas alarm can detect these three gases at the same time, so it is recommended that every family install a household gas alarm, for your safety escort.  
 
The full name of smoke detector is smoke sensing detection alarm, as the name implies, is used to detect smoke, if the concentration of smoke in the environment exceeds the standard, will send an alarm.  We know that fires are often accompanied by smoke, and smoke detectors take advantage of this to detect fires in time.  Therefore, smoke detector can not prevent the occurrence of fire, but can find the fire in the first time, for people's escape or rescue time.  
 

Smoke detectors are usually installed in the ceiling because smoke from a fire rises and eventually accumulates in the ceiling, so they can better monitor smoke concentration.  Now the country attaches great importance to fire safety, most businessplaces have installed smoke detector, if you pay attention to it, you can often see it.