Modes of heat transfer
Direct contact - Identify the mode
Conduction
78 deg celsius to Kelvin
351 Kelvin
Length of a solid increasing due to heat is called ______
Linear expansion
Heat transfer happens when there is a _________
difference in temperature
The only mode that can take place in a vacuum
Radiation
567 Kelvin to celsius
294 celsius
Give the principle of hot air balloons
Thermal expansion in gases
Define boiling point of a liquid
Fixed temperature at which a liquid turns into a gas
Why do candle flames point upwards?
Convection. Warm air near the flame rises
90 deg celsius to deg Farhenheit
194 deg Farhenheit
Give reasons: A bimetallic strip is used in fire alarms
Different rates of expansion of the two different metals caused due to fire results in bending and completes the circuit.
Give any two effects of heat
Relevant answer
Boiling water - Guess the mode
Ice on our hand melting - Guess the mode
Convection
Conduction
41 deg Farhenheit to deg celsius
5 deg celsius
Give a small experiment to show that gases expand on heating.
Relevant experiment
Give an example to show that heat can cause chemical change
Burning of paper etc. Any relevant example