Why Do Some Liquids Burn?
Some liquids will burn because when their molecules mix with the oxygen in the air the mixture becomes combustible. The application of heat
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Oxygen
How Do Fire Extinguishers Work?
Fire extinguishers stop flames either by dousing them in water or by excluding the oxygen which a fire needs in order to burn. There are thr
What Makes People Faint?
What Makes People Faint? The most urgent need of the body-more important even than food or drink-is oxygen, which is found in the air we bre
Why Do Animals Need Oxygen?
Why Do Animals Need Oxygen? We must have oxygen to live. Every living animal cell needs oxygen for its vital metabolic activities (the proce
How Does the Heart Work?
How Does the Heart Work? The heart, which is a muscular pump, beats about 72 times a minute through a continuous and automatic process of mu