Breakfast time condundrums

[GadgetMaster]

I was having breakfast late, as you do on a sunday morning, and i noticed something a bit odd written on the jar of 60% fruit preserve.

Produced with 60g fruit per 100g.
Total sugar content 45g per 100g.

How does that work out? :crazy:

Am I having a slow day here or do Asda need to correct their labelling?

If anyone is interested, it's the Exotic Conserve from their 'Extra Special' range. Made from mango, guava, passion fruit and other goodies.. Brilliant stuff!  :pancake:

[Karlos]

Produced with 60g fruit per 100g.
Total sugar content 45g per 100g.

Firstly, the latter figure is the percentage mass of the overall product that is any kind of sugar. A fair amount of this will have come from the fruit itself.

Secondly, 60g of fruit may go in, but how much of that is water that gets boiled out in the jamming process?

Answers on a post card :-D

[GadgetMaster]

Ah.. that would explain the use of the word "Total".

Still I'm sure they put it that way to confuse many sleepy heads. :-D

[Karlos]

There are stranger things.

If you mix exactly 50ml of pure alcohol and 50ml of pure water, you don't get 100ml of mixture ;-) And that's even before someone tries to quaff it.

[GadgetMaster]

Does a certain amout evaporate during the mixing process?

[Karlos]

GadgetMaster wrote:
Does a certain amout evaporate during the mixing process?

It could, but even assuming you did it in a closed container, the result would be less than 100ml ;-)

[GadgetMaster]

Well I guess it's not as bad as those labels on packs of nuts proclaiming "This product may contain nuts" :lol:  :crazy:

[Karlos]

GadgetMaster wrote:
Well I guess it's not as bad as those labels on packs of nuts proclaiming "This product may contain nuts" :lol:  :crazy:

Which surprises ordinary people and food industry experts allike, but each for different reasons ;-)

[GadgetMaster]

 

Karlos wrote:

GadgetMaster wrote:
Does a certain amout evaporate during the mixing process?

It could, but even assuming you did it in a closed container, the result would be less than 100ml ;-)

:inquisitive:  :inquisitive:

[Karlos]

Karlos wrote:

GadgetMaster wrote:
Does a certain amout evaporate during the mixing process?

It could, but even assuming you did it in a closed container, the result would be less than 100ml ;-)

Basically, all substances comprise of a certain amount of empty space (in strict terms, the vast majority is empty space but here were talking about intermolecular distances).

If you dissolve a certain volume of salt in water, there's no appreciable change in volume of the water. The dissociated ions are free to roam around the spaces between the H20 molecules (a very simplified picture there, but that's the gist). Overall, the volume has gotten less (ie the volume occupied by the salt has been lost), but the mass has stayed the same, ie, the liquid is denser.

When you mix water and alcohol, each one effectively partially "dissolves" into the other, resulting in a decrease in overall volume. As expected, mass is conserved, so a 50/50 mix is naturally more dense than pure alcohol, but less dense than the pure water.

To summarise it, you always observe conservation of mass, but conservation of volume is, in fact, rarely guarenteed (at least for liquids and solids - gases have their own rules)

[GadgetMaster]

Karlos wrote:

Gases have their own rules)

And smells  :lol:

.....now where did I put my coat

[GadgetMaster]

Karlos wrote:

Karlos wrote:

GadgetMaster wrote:
Does a certain amout evaporate during the mixing process?

It could, but even assuming you did it in a closed container, the result would be less than 100ml ;-)

Basically, all substances comprise of a certain amount of empty space (in strict terms, the vast majority is empty space but here were talking about intermolecular distances).

If you dissolve a certain volume of salt in water, there's no appreciable change in volume of the water. The dissociated ions are free to roam around the spaces between the H20 molecules (a very simplified picture there, but that's the gist). Overall, the volume has gotten less (ie the volume occupied by the salt has been lost), but the mass has stayed the same, ie, the liquid is denser.

When you mix water and alcohol, each one effectively partially "dissolves" into the other, resulting in a decrease in overall volume. As expected, mass is conserved, so a 50/50 mix is naturally more dense than pure alcohol, but less dense than the pure water.

To summarise it, you always observe conservation of mass, but conservation of volume is, in fact, rarely guarenteed (at least for liquids and solids - gases have their own rules)

Interesting stuff. I should have payed a little more attention in school :-D

[GadgetMaster]

Karlos wrote:

GadgetMaster wrote:
Well I guess it's not as bad as those labels on packs of nuts proclaiming "This product may contain nuts" :lol:  :crazy:

Which surprises ordinary people and food industry experts allike, but each for different reasons ;-)

Yes, They are surprised that they actually included some natural ingredients in their products  :lol:

[Karlos]

@Gadget

Here's a conundrum for you. A bit of a tenuous link, but when fasting, everybody seems to use the word "open" to describe the end of the fast and "close" to describe the start.

I often hear the question "have you opened your fast?" meaning did I end my fast?

Is it me, or is that just totally confusing and patently the wrong way around?

Surely, "opening" something implies you are starting with it and closing implies you are finished with it. You open a door, a bank account, a carton, a library, a file...

It's not even as if the words "open" and "close" are that good - surely "started" and "ended" are more relevant :-D

Where does this strange terminology (and seemingly inverted meaning) stem from? Or is it just unique to muslims in Manchester?

[GadgetMaster]

You are right. It is confusing and completely wrong but the easy part I do know from where this strange use of language originates.

It is direct a translation from the urdu which doesn't quite work in English but is still used regardless. Open and close is used to describe the restrictions on eating and drinking hence when the fast starts the permission to eat ends or  "closes" (in Urdu).

In the evening the restrictions are lifted or "Opened" (again in Urdu)

I hope that made sense.