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4 votes

Would a cubic light year of ice cream collapse into a black hole?

You're obscuring the obvious through a lot of math/calculations. The mass of a cube is $\rho a^3$ where $a$ is the side length in meters. The schwarzchild radius of a cube is therefore $ r_s = \frac{...
Señor O's user avatar
  • 7,658
0 votes

What does Density really mean?

There is no distinction between gravitational and inertial mass therefore, mass is a measure of how much matter there is. In this sense, density is a measure of how compressed or rarefied the matter ...
Albertus Magnus's user avatar
1 vote
Accepted

Current density and units

Volumetric Current density is typically the amount of current per area flowing through a cross-section. Since current is a word for charge-per-time, current density is charge-per-time per area. In SI ...
Steeven's user avatar
  • 51.1k
1 vote

Current density and units

These are the physical dimensions, since a current density is defined as the product of a charge density and the average velocity of the charges, namely $$\mathbf{j} = \rho \mathbf{v} \qquad , \qquad \...
basics's user avatar
  • 8,980
0 votes

Current density and units

According to your comment, $\vec{\lambda}$ has simply the dimension of current. It is a linear current produced by a line charge with a line charge density, not a "linear current density". ...
freecharly's user avatar
  • 16.7k
0 votes

Do the weights of two liquids not add when mixed?

You need to bake more 😊 Go scoop a cup of flour and put it on a zero’d scale. Record the measurement. Now do it again. And again. You will get all different readings. And this is why in most European ...
Taryn's user avatar
  • 1
2 votes

Is air less dense than chimney exhaust?

Your answer is correct, simply because the high temperature of the chimney exhaust overcomes any difference in density between atmospheric air and flu gas because of chemical composition. The flu gas ...
ttonon's user avatar
  • 267
6 votes

Is air less dense than chimney exhaust?

This actually has an interesting connection to volcanism. Volcanic plumes (similar to chimney exhaust) are far more dense than the air around them, but they rise, sometimes as high as 20 kilometers. ...
Joshua Knicely's user avatar
10 votes

Is air less dense than chimney exhaust?

Chimney exhaust is pumped by the density of the cool ambient air being greater than that of the heated gasses coming from a fire. Density times column height of the chimney puts less pressure at the ...
Whit3rd's user avatar
  • 9,883
12 votes

Is air less dense than chimney exhaust?

Particulate matter The density of airborne particulate matter (PM10 and PM2.5) in smoke is rather low, less than a few grams per cubic meter at most. (The linked paper contains direct ground-level ...
Vincent Thacker's user avatar
34 votes
Accepted

Is air less dense than chimney exhaust?

The question that you are quoting is a very poor question, since the answer depends on what is being burnt to produce the exhaust from the chimney and how far away from the chimney we measure the ...
gandalf61's user avatar
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