Ask a physicist anything. (8)

[Chesterton]

When you are looking at a grain of sugar you are looking at countless sugar molecules. They are relatively weakly joined together. When exposed to pure water the weak bonds between different crystals break since it is more strongly attracted to the hydrogen in water. In the water one molecule will not strongly attach to any one molecule of water, it will migrate from water molecule to water molecule. At any rate the crystal will "disappear" as more and more crystals leave the lattice of the grain to dissolve into water.

If you raise the concentration of sugar in the water high enough, usually by boiling water away, the remaining sugar will start to become attracted to other molecules of sugar because the hydrogen in the water already is attracted to too many sugar molecules.

So the individual water and sugar molecules stay intact, but attach to each other?

 

[Subduction Zone]

So the individual water and sugar molecules stay intact, but attach to each other?

They do not permanently attach to each other, they are attracted to each other.

 

[Wiccan_Child]

So the individual water and sugar molecules stay intact, but attach to each other?

They do not permanently attach to each other, they are attracted to each other.

I like the analogy of Tarzan swinging on vines - he's always on a vine (or, briefly, soaring through the air), but he's never on any one specific vine for long.

 

[Chesterton]

I sometimes get mass and weight confused. If you add 1 dry ounce of sugar to 9 liquid ounces of water, you don't get 10 ounces of liquid, do you? But would the amount of mass in the glass increase by the amount of mass in the sugar?

 

[Loudmouth]

I sometimes get mass and weight confused. If you add 1 dry ounce of sugar to 9 liquid ounces of water, you don't get 10 ounces of liquid, do you? But would the amount of mass in the glass increase by the amount of mass in the sugar?

You are getting volume and mass confused on this one. Ounces are used as both a unit of weight and a unit of volume. For everything but water, they are different units. If you add sugar to water it will weigh more than one ounce per ounce of volume.

 

[Wiccan_Child]

I sometimes get mass and weight confused. If you add 1 dry ounce of sugar to 9 liquid ounces of water, you don't get 10 ounces of liquid, do you? But would the amount of mass in the glass increase by the amount of mass in the sugar?

Correct on both counts. It comes from the fact that 'ounce' can refer to both volume and mass, and there are various of those, too.

VOLUME
1 imperial fluid ounce is about 28.413 ml
1 US fluid ounce is about 29.573 ml

MASS
1 international avoirdupois ounce is about 28.350 g
1 international troy ounce is about 31.104 g

This is further complicated by the fact that 1 ml of water has a mass of 1 g, so you may well get 10 liquid ounces of fluid!

 

[Michael]

I sometimes get mass and weight confused. If you add 1 dry ounce of sugar to 9 liquid ounces of water, you don't get 10 ounces of liquid, do you?

Actually, yes you do get 10 ounces of liquid. The difference would be that the sugar water would be more dense than plain/pure water. If you compared your glass of sugared water to a 10 ounce glass of pure water, they wouldn't necessarily be exactly equal in terms of their volume. They would still both weight exactly ten ounces however.

 

[Michael]

It comes from the fact that 'ounce' can refer to both volume and mass, and there are various of those, too.

I did not know that.

 

[Zippy the Wonderslug]

How fast would one need to travel through both ends of the universe in a 24 hour trip?

What would it look like?

In theory, is it even remotely possible to do this in a straight line?

Cheers.

 

[Chesterton]

How fast would one need to travel through both ends of the universe in a 24 hour trip?

Is it established that the universe has "ends"?

 

[pgp_protector]

How fast would one need to travel through both ends of the universe in a 24 hour trip?

What would it look like?

In theory, is it even remotely possible to do this in a straight line?

Cheers.

Using the size of the Visible Universe;
92 billion light years
Divide by 24
So your required speed would be 3.83 Billion Light Years per Hour.
or 5878499810000(Miles in a Light Year) * 3833333333 = 2.253424926970717e+22 MPH (If my Math is right )

 

[Michael]

Using the size of the Visible Universe;
92 billion light years
Divide by 24
So your required speed would be 3.83 Billion Light Years per Hour.
or 5878499810000(Miles in a Light Year) * 3833333333 = 2.253424926970717e+22 MPH (If my Math is right )

Sorry, but the cosmic highway patrol will pull you over the moment you try to exceed the speed of light.

 

[pgp_protector]

Sorry, but the cosmic highway patrol will pull you over the moment you try to exceed the speed of light.

Didn't say you can go that fast, just that's the speed needed to go 92 Billion Light years in 24 Hours

 

[sfs]

Is it established that the universe has "ends"?

No. But you can define the limits of the visible universe.

 

[Subduction Zone]

Didn't say you can go that fast, just that's the speed needed to go 92 Billion Light years in 24 Hours

You have forgotten that the universe itself has grown over time.

Using the admittedly imperfect comparison of the universe to a balloon that is being inflated. Two dots on the balloon with an ant traveling between the two dots being the equivalent of a photon of light traveling between stars. Depending upon how far apart the stars were when the photon left, or how far apart the dots were when the ant left the two dots.

The ant may reach a dot that is two far away for it to travel to now.

Sorry, need more coffee to make this clearer.

 

[Ellwood3]

Why would you want this thread to die?

I'll hazard a guess that it's because too many people parade science around like it's a reason not to believe in God.

The most important questions to ask a physicist--or anyone, is--do you know Christ Jesus, and are you saved? Do you follow Him?

If not ... maybe take a quantum leap into faith sometime.

 

[Subduction Zone]

How fast would one need to travel through both ends of the universe in a 24 hour trip?

What would it look like?

In theory, is it even remotely possible to do this in a straight line?

Cheers.

Physicists do not even know how big the universe is. They have an estimated minimum size which is still much larger than the observable universe.

 

[Subduction Zone]

I'll hazard a guess that it's because too many people parade science around like it's a reason not to believe in God.

The most important questions to ask a physicist--or anyone, is--do you know Christ Jesus, and are you saved? Do you follow Him?

If not ... maybe take a quantum leap into faith sometime.

Science is largely "god neutral". It does debunk certain false beliefs, but people should welcome that. People very often have real questions that they would like the answer to for which the only person to ask is a physicist. Remember that your life depends heavily upon science.

 

[Wiccan_Child]

I'll hazard a guess that it's because too many people parade science around like it's a reason not to believe in God.

I've never seen anyone say that, not least because it's not true.

This thread is a long one indeed, and the vast majority of posts have been either genuine questions and answers (on physics, science, or mathematics), or the odd snarky Christian telling us off for being knowledgeable. Fortunately, most Christians don't fall into the latter category.

The most important questions to ask a physicist--or anyone, is--do you know Christ Jesus, and are you saved? Do you follow Him?

Do I know Christ? Yes, but probably not in the way you mean.
Am I saved? I'd say "saved from what?", which probably means 'no'.
Do I follow him? Usually not.

If not ... maybe take a quantum leap into faith sometime.

Why on Earth would anyone do that? Unless there's a good reason to convert, why should I suddenly abandon everything and leap into a religion? Indeed, if there's no good reason to convert, there's nothing to say which religion I should jump into.

So, Ellwood3, I'll do what you say: I'll take a quantum leap into Scientology. Thetans! Xenu! Tom Cruise!

 

[Michael]

Physicists do not even know how big the universe is. They have an estimated minimum size which is still much larger than the observable universe.

Yep, and only two theories require faster than light speed expansion of a universe full of matter, YEC and Lambda-CDM.