# Shared Flashcard Set

## Details

Section 4(a) (b) (c)
Questions IGCSE Physics
5
Physics
Not Applicable
06/22/2017

Term
 Explain what happens to the mercury in a barometer when pressure increases.
Definition
 A barometer is used to measure atmospheric pressure. When pressure increases the molecules in the air exert a downward on the force on the mercury in the barometer pushing it up the tube, giving a higher reading. At sea level the pressure is 760mm of mercury.
Term
 How does the density of a liquid of a liquid relate to the pressure it exerts, and what formula is related to it?
Definition
 A liquid with a greater density will exert a greater pressure. This is because there is more mass of the liquid at even the same depth, creating a higher gravity force pushing down on the same area, thus greater pressure. p= ρxgxh densityxgravityxheight
Term
 Explain the molecules in a liquid, mention volume.
Definition
 The molecules in a liquid have a fixed volume depending on its container. They have no fixed pattern. The molecules slide past each other.
Term
 The amount of heat required to heat a 1kg object by 1℃ is called what?
Definition
 Specific heat capacity is the amount of heat required to heat an 1 kg object by 1℃Formula, q=mc∆t
Term
 The amount of energy required to convert 1kg of a substance from liquid to gas and gas liquid is called what?
Definition
 It is called the latent heat of vaporisation. When you change the state of a substance you only change the potential energy.Formula L=Q/m
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