I had no idea how long to set the microwave for my soup so I did it in short bursts to avoid an accident. I realised later I could do a rough calculation. I used half of 600g container, so mass is 0.3kg. Let's assume it's water. From fridge to boiling is 95oC temperature change. Energy = m. c. Delta Theta = 0.3 x 4200 x 95 = 120000J to 2sf. I used 900 Watts so 900 Joules per second. Time would be around 2. 25 minutes. But allow for heating the bowl and unknown efficiency then 3 mins would be a decent starting point next time.
