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A filter is something that lets some things pass through it, but stops other things. Filters are found in many places. When you make coffee, you use a filter to stop the solid parts of the coffee from getting in the liquid part that you drink.
The filters in the picture are a clean and dirty air filter. The filter on the right is full of all the dirt and grime that has been stopped from going through the filter.
The filters in the picture are a clean and dirty air filter. The filter on the right is full of all the dirt and grime that has been stopped from going through the filter.
Filth is disgusting, dirty waste. You might also use filth as an insult, for example "you people are all filth".
F is for Fingernail
F is for Fingerprint
When something is burning, it is said to be on fire. Flames can be different colours depending on what is burning and how hot it is. Fire is very hot and bright, and people light fires in their houses to keep warm.
When a fire is out of control it can be extremely dangerous, such as a forest fire.
When something burns it gives off gas and particles as smoke. It gives off heat because burning is an exothermic reaction, which means it creates heat as it happens. Some things like boiling water are the opposite, and need heat to happen.
When a fire is out of control it can be extremely dangerous, such as a forest fire.
When something burns it gives off gas and particles as smoke. It gives off heat because burning is an exothermic reaction, which means it creates heat as it happens. Some things like boiling water are the opposite, and need heat to happen.
F is for Fire engine
F is for Fire hydrant
F is for Firefighter
