We have been making sure we know what it means to be firewise.Today we had a visit from the local fire brigade in Tawa. Simon reminded us all about keeping safe and also let us look around the big fire truck
Showing posts with label Fire. Show all posts
Showing posts with label Fire. Show all posts
Tuesday, 15 April 2014
Visit from the Volunteer Fire Brigade
We have been making sure we know what it means to be firewise.Today we had a visit from the local fire brigade in Tawa. Simon reminded us all about keeping safe and also let us look around the big fire truck
Monday, 14 April 2014
Smoke Rises
As pert of our "Firewise" investigation, we know that in the event of a fire we need to "Get down, get low, and get out fast".
Today though, we looked at why we have to do this.
We lit a big candle and put a glass jar partially over it. We let the candle burn for a little bit and the jar 'caught' some smoke before putting the jar completely over the candle.
What happened (beside the candle going out) was that the smoke rose to the top of the jar and there was a clear gap at the bottom. We think that s because the smoke would have been hotter that the air and as heat rises, the smoke did too.
Today though, we looked at why we have to do this.
We lit a big candle and put a glass jar partially over it. We let the candle burn for a little bit and the jar 'caught' some smoke before putting the jar completely over the candle.
What happened (beside the candle going out) was that the smoke rose to the top of the jar and there was a clear gap at the bottom. We think that s because the smoke would have been hotter that the air and as heat rises, the smoke did too.
Thursday, 10 April 2014
What happens when fire burns up oxygen
We have been looking at how fire burns. This is a neat experiment but needs to be done with a grown-up.
What to do:
1. Add enough water to fill the bottom of the container.
2. Put 3 or 4 drops of your favourite colour of food colouring into the water and mix it up.
3. Place the candle in the middle of the container. (We used blutac to stick it down)
4. Light the candle.
5. Take the glass jar and place it over the lit candle.
You need
- Candle and matches
- container
- glass jar
- Water
- Food colouring
- Candle and matches
- container
- glass jar
- Water
- Food colouring
What to do:
1. Add enough water to fill the bottom of the container.
2. Put 3 or 4 drops of your favourite colour of food colouring into the water and mix it up.
3. Place the candle in the middle of the container. (We used blutac to stick it down)
4. Light the candle.
5. Take the glass jar and place it over the lit candle.
What happens to the
water level inside the glass? What happens to the flame on the
candle?
What’s going on:
The flame on the candle needs the gas oxygen to keep burning. Once we place the glass
container over the lit candle, the oxygen inside begins to get used up. Once all the oxygen has
been used, the flame will go out. However, there are still other gases remaining inside the
glass (nitrogen, argon, carbon dioxide, etc). But these gases have lower pressure inside the
glass when compared to the higher atmospheric pressure on the outside of the glass. This
higher atmospheric pressure from the outside pushes the water from the plate up and into the
glass.
candle?
What’s going on:
The flame on the candle needs the gas oxygen to keep burning. Once we place the glass
container over the lit candle, the oxygen inside begins to get used up. Once all the oxygen has
been used, the flame will go out. However, there are still other gases remaining inside the
glass (nitrogen, argon, carbon dioxide, etc). But these gases have lower pressure inside the
glass when compared to the higher atmospheric pressure on the outside of the glass. This
higher atmospheric pressure from the outside pushes the water from the plate up and into the
glass.
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