Chapter 4 Flashcards
a device that measures air pressure
barometer
an ionize gas
plasma
each is composed of two or more atoms
molecule
the relative presure between two places
gauge pressure
a combination of different elements or compounds
mixture
the upward force exerted by a fluid on anything immersed in it
buoyant force
the smallest unit of a chemical element
atom
the mass density of a substance divided by the mass density of water
specific gravity
particle that orbits the nucleus in an atom
electron
a unit of measure for pressure
atmosphere
the pressure exerted by a gas is the result of
molecular collisions
a device that measures absolute air pressure is called a
barometer
the difference between the pressure inside a tire an outside a tire is called the
gauge pressure
what are the units of pressure
atmosphere, psi, N/m, mmHg, pascal
normal atmospheric pressure is
14.7 psi, 760 mmHg, 101,000 pascals
if the same sized force is made to act over a smaller area the pressue is
increased
a plasma state of matter is
an ionized gas
the upwar force exerted by a fluid on an object immersed in it is called
buoyant force
when an object floats in a liquid, the buoyant force is
equal to the weight of the object
the nucleus of an atom contains
protons and neutrons
the positively charged particle inside an atom is the
proton
the non charge particle in an atom is the
neutron
the central core inside an atom is the
nucleus
the particle that orbits the central core of an atom is the
electron
the molecule is the basic unit of all
compounds
DNA is a complex
molecule
in the chemical formua for water, H2O, what does two mean
there are two hydrogen atoms in a molecule of water
how many elements have been identified
114
the buoyant force that jkeeps a ship afloat is an example of
Archimedes Principle
the brakes in a car work because of
Pascals principle
an atomizer works because of
Bernouli’s Principle
a helium balloon rises because of
Archimedes’ principle
when you suck through a straw, the force that makes the liquid go u the straw is
due to the pressure of the atmosphere
the ratio of the density of a material to the density of water is the
specific gravity
Water is flowing through a pipe whose cross sectional point at A is larger than the cross sectional area at point B. the reading on a pressure gauge connected to the pipe at point A willl be
Higher than the reading on a pressure gauge at Point B
T/F a device that measures absolute air pressue is called a barometer
TRUE
T/F the difference between the inside and outside of the tire is called the absolute pressure
FALSE
T/F the SI unit of pressure is the pascal
TRUE
T/F psi is a unit of force
FALSE
T/F an ionized gas is called plasma
TRUE
T/F plasma will conduct electricity
TRUE
T/F gases an liquis are both fluids
TRUE
T/F the upward force exerted by a fluid on an object immersed in it is called the buoyant pressure
FALSE
T/F when an object floats in a liquid, the buoyant force is larger than the wight of the object
FALSE
T/F the positively charged particle inside an atom is the nucleus
FALSE
T/F the uncharged particle inside an atom is the neutron
TRUE
T/F the central core in an atom is the neutron
FALSE
T/F the object that orbits the central core inside an atom is the electron
TRUE
T/F the number of protons in a nucleus of an atom tells which element it is
TRUE
T/F the buoyant force that keeps the ship afloat is an example of Pascals Principle
FALSE
T/F the brakes in a car work because of Pascals principle
TRUE
T/F an atomizer works because of Bernouli’s principle
TRUE
T/F a helium balloon rises because of Archimedes’ princilpe
TRUE
T/F air can be compressed easily because there is a great deal of empty space between air molecues
TRUE
T/F grvity causes the pressure in the ocean to vary by depth
TRUE
T/F in a flowing fluid the pressure where the fluid is moving slower is higher than the presure where the fluid is moving faster
TRUE
