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Air, water, glass, paper, wood etc. are bad conductors of heat.
Substances that allow heat to pass through them are called conductors. Metals like silver, copper, iron, aluminium etc. are good conductors of heat.
Only basic solutions can be identified by turmeric.
Saliva mixes with bread and converts starch present in the bread to sugar. Thus it gives sweet taste.
Infection due to bacteria and virus, food that is not digested by the body, diseases of intestine etc. are the causes of diarrhoea.
The food forms a bolus in the mouth after mixing with saliva. The bolus is passed into the stomach through a long muscular pipe called oesophagus.
When the stomach cannot pass on undigested to the small intestine, it tries to compress the food and contracts involuntarily pushing the food back to the mouth.