Physics 01
How Much Electricity Does a Geyser Use? Units and Cost
A 25 litre geyser heating four 20 litre baths a day uses about 86 units a month, ₹604 at ₹7. Heating time, standing loss, instant, heat pump and solar.
heat
Environment 02
Why Does Humid Heat Feel Hotter Than Dry Heat?
Sweat only cools you when it evaporates, and humid air slows that down. The heat index puts a number on it: 32 °C at 70% humidity feels like 40 °C.
Physics 03
Why Does Water Have Such a High Specific Heat?
Water needs 4.184 J to warm one gram by 1 °C, over nine times as much as iron. Light molecules and hydrogen bonds explain why, with worked numbers.