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Density
New post in Density
Will a penny ever stand still in the water at a certain depth?
August 1st, 2022
fluid-statics
pressure
buoyancy
density
Does an object float more or less with more or less gravity?
September 15th, 2020
gravity
buoyancy
density
water
Why is jumping into water from high altitude fatal?
October 18th, 2020
density
air
aerodynamics
water
experimental-physics
How can super massive black holes have a lower density than water?
August 1st, 2022
density
event-horizon
black-holes
Why does the speed of sound decrease at high altitudes although the air density decreases?
September 17th, 2020
fluid-dynamics
waves
acoustics
air
density
Do the weights of two liquids not add when mixed?
September 21st, 2020
weight
mass
everyday-life
density
buoyancy
Are black holes very dense matter or empty?
April 2nd, 2020
general-relativity
black-holes
density
singularities
event-horizon
Why does sound not move through a wall?
May 4th, 2020
pressure
acoustics
density
waves
Are there physical properties that can be used to differentiate stainless steel from copper in a home environment?
January 26th, 2020
metals
physical-chemistry
material-science
home-experiment
density
Why do rotten eggs float in water?
June 3rd, 2021
density
buoyancy
everyday-life
fluid-statics
physical-chemistry
Can I eat myself into a black hole?
July 5th, 2020
black-holes
density
estimation
Given that ice is less dense than water, why doesn't it sit completely atop water (rather than slightly submerged)?
October 31st, 2020
free-body-diagram
density
buoyancy
fluid-statics
The Density of Clouds
August 1st, 2022
density
weather
fluid-statics
atmospheric-science
Is there anything in the universe that cannot be compressed?
December 13th, 2020
point-particles
density
particle-physics
elementary-particles
collision
Why does carbon dioxide not sink in air if other dense gases do?
February 27th, 2022
gas
density
How is water heavier than petrol, even though its molecular weight is less than petrol?
June 6th, 2020
mass
molecules
density
physical-chemistry
Is it possible to have a Gas heavier than a liquid?
August 1st, 2022
density
states-of-matter
Besides water, which substances are less dense as solids than as liquids?
August 1st, 2022
phase-transition
density
states-of-matter
Why does a black hole have a finite mass?
January 15th, 2020
black-holes
mass
density
singularities
Why does a floating object displace more substance than a sunk object?
August 1st, 2022
newtonian-mechanics
fluid-statics
free-body-diagram
density
buoyancy
Which weighs more in atmosphere, $1\,{\rm kg}$ of steel or $1\,{\rm kg}$ of feathers?
August 1st, 2022
mass
weight
buoyancy
fluid-statics
density
What is exactly the density of a black hole and how can it be calculated?
August 1st, 2022
black-holes
singularities
density
event-horizon
Why does sound travel faster in iron than mercury even though mercury has a higher density?
August 1st, 2022
density
acoustics
What are some dense elements I can use for a demonstration?
June 9th, 2020
density
experimental-physics
metals
Before a once-warm lake starts to freeze, must its temperature be 4°C throughout at some point?
December 7th, 2020
density
fluid-dynamics
water
temperature
Why singularity in a black hole, and not just "very dense"?
August 1st, 2022
singularities
density
event-horizon
black-holes
Calculating mass from just density?
August 1st, 2022
density
What is the density of compressed natural gas (CNG) used in vehicles?
April 14th, 2020
hydrocarbons
density
gas-laws
How high in (mmH2O) is the column of water in the tube?
January 10th, 2020
homework
density
pressure
Liquid floating on top of water due to density or insolubility?
August 1st, 2022
density
solubility
water
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