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kupik [55]
3 years ago
8

a difference in density between gases creates buoyancy, which is the ability of an object to float. At 0 degrees celsius, helium

has a density of 0.18kg
Chemistry
1 answer:
GaryK [48]3 years ago
3 0

Answer: for an object or gas or liquid to float in another there must be a difference in density

Explanation:

Helium has a density of 0.18 kg/m³ and air has a density of 1.29 kg/m^³. If a balloon is filled with helium it will float in air due to density differences

Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces

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It get hotter towards the center
STatiana [176]

Answer:

earth

Explanation:

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Explain why the fingertip and not the palm of the hand is used to detect braille symbols​
8090 [49]

Answer:

The Braille is the dots arranged in cell to identify the letter, number and symbols. the Braille system is identified using the fingers. the fingertip is used for identifying the nature of number and symbol. the difference is made by detecting the number and symbol.

Explanation:

Hope this helped Mark BRAINLEST!!!!

3 0
2 years ago
The mass of the atom is found by adding is protons and neutrons the electrical charge of an atom is found by adding the charge i
Hitman42 [59]
When you combine protons and neutrons in the electrical charge they combine to make electricity
3 0
3 years ago
NaOH (aq) + HCl(aq) H2O + NaCl (aq)
yuradex [85]

Answer:

The answer to your question is 0.005

Explanation:

Data

Volume of NaOH = 25 ml

[NaOH] = 0.2 M

moles of NaOH = ?

To solve this problem is not necessary to have the chemical reaction. Just use the formula of Molarity and solve it for moles.

Formula

Molarity = moles / volume

-Solve for moles

moles = Molarity x volume

-Convert volume to liters

          1000 ml ---------------- 1 l

              25 ml ---------------- x

               x = (25 x 1) / 1000

               x = 0.025 l

-Substitution

moles = 0.2 x 0.025

-Result

moles = 0.005

7 0
3 years ago
an atmosphere is considered hazardous if it contains a hazardous gas in excess of 10 percent of the hazardous material's:
svlad2 [7]

Lower flammable limit means the lowest concentration of a material that will propagate a flame.

What is hazardous atmosphere?

It is an atmosphere that may expose employees to risk of death, incapacitation, impairment of ability to self-rescue, injury, or acute illness from one or more of following causes

  • Flammable gas, vapor, or mist in excess of 10 percent of lower flammable limit (LFL)
  • Airborne combustible dust at concentration that meets or exceeds its LFL

What is lower flammable limit?

  • It means the lowest concentration of a material that will propagate a flame.
  • The LFL is usually expressed as percent by volume of material in air (or other oxidant)
  • Atmospheres with concentration of flammable vapors at or above 10 percent of lower explosive limit (LEL) are considered hazardous when located in confined spaces.
  • However, atmospheres with flammable vapors below 10 percent of LEL are not necessarily safe. Such atmospheres are too lean to burn

Learn more about lower flammable limit at brainly.com/question/2456135

#SPJ4

6 0
1 year ago
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