Keep the Heat B/Thermodynamics C

[awesome90220]

Isn't there a maximum of 150mL for testing???

For division B, regionals is 100-200, in 25 mL increments, so they weren't allowed to do 170

[sjwon3789]

So could anyone answer my question: Are cement glue considered as "expandable glue?"
I don't really understand when they say "expandable glue." Doesn't all glues expand?

[chalker]

So could anyone answer my question: Are cement glue considered as "expandable glue?"
I don't really understand when they say "expandable glue." Doesn't all glues expand?

Most glues don't expand by any noticable amount (and in fact a lot actually shrink as they harden).

[sjwon3789]

What about some glue that doesn't change size (solid)? It looks like it's expandable since it's solid but it's actually not...

[harryk]

So could anyone answer my question: Are cement glue considered as "expandable glue?"
I don't really understand when they say "expandable glue." Doesn't all glues expand?

What about some glue that doesn't change size (solid)? It looks like it's expandable since it's solid but it's actually not...

Expandable glue is considered to be glues that greatly increase in volume when hardening, often turning into a hard foam. The most well known type of expanding glue is Gorilla Glue, if you've ever used it you'll know why. So if your glue doesn't do that, than you should be fine.

As for cement, real cement glue consists of a solvent often containing dissolved material of whatever the glue is meant for(ex. ABS cement will have dissolved ABS in a bottle of solvent). Cements work by actually chemically melting the surface and then in essence welding the two pieces together. Unfortunately many glues are called cement that aren't really cement.

[awesome90220]

So could anyone answer my question: Are cement glue considered as "expandable glue?"
I don't really understand when they say "expandable glue." Doesn't all glues expand?

What about some glue that doesn't change size (solid)? It looks like it's expandable since it's solid but it's actually not...

Expandable glue is considered to be glues that greatly increase in volume when hardening, often turning into a hard foam. The most well known type of expanding glue is Gorilla Glue, if you've ever used it you'll know why. So if your glue doesn't do that, than you should be fine.

As for cement, real cement glue consists of a solvent often containing dissolved material of whatever the glue is meant for(ex. ABS cement will have dissolved ABS in a bottle of solvent). Cements work by actually chemically melting the surface and then in essence welding the two pieces together. Unfortunately many glues are called cement that aren't really cement.

Is there any type of list for expandable glues?

[harryk]

So could anyone answer my question: Are cement glue considered as "expandable glue?"
I don't really understand when they say "expandable glue." Doesn't all glues expand?

What about some glue that doesn't change size (solid)? It looks like it's expandable since it's solid but it's actually not...

Expandable glue is considered to be glues that greatly increase in volume when hardening, often turning into a hard foam. The most well known type of expanding glue is Gorilla Glue, if you've ever used it you'll know why. So if your glue doesn't do that, than you should be fine.

As for cement, real cement glue consists of a solvent often containing dissolved material of whatever the glue is meant for(ex. ABS cement will have dissolved ABS in a bottle of solvent). Cements work by actually chemically melting the surface and then in essence welding the two pieces together. Unfortunately many glues are called cement that aren't really cement.

Is there any type of list for expandable glues?

You could search google for a list, but since the number of different glues is so great(practically infinite), you're unlikely to find a useful list. It should just be common sense to identify an expanding glue. Let a test sample harden and if it grew in volume and is now full of air bubbles, it is an expandable glue. If it didn't, then its not.

[sjwon3789]

Also, do we need to take out our beaker? Like, my beaker is attached to this insulators (not transparent)...?

[awesome90220]

Also, do we need to take out our beaker? Like, my beaker is attached to this insulators (not transparent)...?

In the two competitions, I have had so far, I would have to say, YUP

[135scioly]

So you mean your internal beaker can't come out of your insulating device? I would think that might be difficult to fill up with hot water, and they might want to make sure it really is a 250 ml beaker for impound. So I'm guessing no....?