# Expansion in size

Home Forums Glass Fusing General Fusing Discussion Expansion in size

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• #10307
ranasen
Participant

Hi

I am a new member. I recently bought a Paragon kiln with lid on top. I have very much to learn and want therefore to start by doing some of the tutorials Paul so generously donated to the forum.

I will try my hand att his puddles. I think I understand most of it but have a question about how far thr stacks of glass need to apart from one another. I am not a mathematician but here is what I thought:

If my stack is 25 mm high and this stack wants to go down to the infamous 6 mm in height am I thhen correct in assuming that my stack will be 4,75 mm larger at each side?

This is how I did my arithmatic

25mm minus 6 mm = 19 mm

19 mm : 4 = 4.75  mm

The reason I wanted to know is is to be sure that I had enough plce between them when placing the stacks in my kiln.

Grateful for an answer/explanation and greetings from  still not white Sweden

Helene

#13572
Chichille8
Participant

It’s a matter of volume. Let’s say the mass will not be altered in the process; so, the volume will be the same at the end. This volume is calculated by Surface (S)  X Height (H). So, beginning S X H = ending S X H.

So, (beginning S X H) / (ending H) = ending S.

This ending Surface is the answer you need.

#13573
ranasen
Participant

Hi

Thank you for your answer. Not being a calculus wonder I need to mull this over. However, I took the plunge and placed them well apart. Their growth was actually not so far off as I calculated in my question. I used the fire scheme that was provided but had an awfull lot of small bubbles on the surface. I do not think it was devitrification though. Tomorrow I will do my second firing and keeping my fingers crossed. Thanks again!

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